Heteroannulations of cyanoacetamide-based MCR scaffolds utilizing formamide

• Marios Zingiridis,
• Danae Papachristodoulou,
• Despoina Menegaki,
• Konstantinos G. Froudas and
• Constantinos G. Neochoritis

Beilstein J. Org. Chem. 2025, 21, 217–225, doi:10.3762/bjoc.21.13

• be established as a C1 feedstock. [25]. Its high polarity and dielectric constant (it is miscible with water) [26], with the ability to solubilize a wide range of reagents, from salts to polymers, proteins and saccharides, renders formamide an excellent C1 building block [25][27]. Thus, our target

Nickel-catalyzed cross-coupling of 2-fluorobenzofurans with arylboronic acids via aromatic C–F bond activation

• Takeshi Fujita,
• Haruna Yabuki,
• Ryutaro Morioka,
• Kohei Fuchibe and
• Junji Ichikawa

Beilstein J. Org. Chem. 2025, 21, 146–154, doi:10.3762/bjoc.21.8

• water, which effectively promoted the reaction and resulted in a 70% yield of 3bi. Furthermore, when methoxy- and ethoxy-substituted benzofurans 1c and 1d were used, the corresponding coupling products 3ca and 3da were obtained with yields of 67% and 65%, respectively. Additionally, in the coupling

Cu(OTf)₂-catalyzed multicomponent reactions

• Sara Colombo,
• Camilla Loro,
• Egle M. Beccalli,
• Gianluigi Broggini and
• Marta Papis

Beilstein J. Org. Chem. 2025, 21, 122–145, doi:10.3762/bjoc.21.7

• known processes, a particular Mannich-type reaction was realized in water in the presence of a dendritic 2,2’-bipyridine ligand 2 and Cu(OTf)2 (Scheme 2) [16]. The hydrophobic ligand surrounding the metal revealed to be essential for the organic synthesis in water, thus increasing the reaction yields

• the allyl carbenium ion VI through the loss of a molecule of water, then undergoes a Friedel–Crafts alkylation by attack of the aromatic partner. The outcome of the reaction proceeds through a Markovnikov protonation of the allylated arene VII by triflic acid, which generates the carbocation

• formation releasing Cu(OTf)2. The final bicyclic product 33 arises from isomerization and water elimination. Recently, Singh's research group developed a cascade process to access imidazo[1,2-a]pyridines-linked isoxazoles 35. Isoxazole carbaldehydes treated with 2-aminopyridines and isonitriles in the

Hot shape transformation: the role of PSar dehydration in stomatocyte morphogenesis

• Remi Peters,
• Levy A. Charleston,
• Karinan van Eck,
• Teun van Berlo and
• Daniela A. Wilson

Beilstein J. Org. Chem. 2025, 21, 47–54, doi:10.3762/bjoc.21.5

• properties are crucial, particularly its permeability. Excessive permeability allows water molecules – and potentially larger molecules – to traverse the membrane without exerting adequate force, undermining the transformation process [20][21]. Lastly, membrane stiffness plays a role; the stiffness of the

• response [23][24][25]. An excessive stiffness will eventually even impede deformation entirely [26]. This characteristic is harnessed in systems to stabilize shapes by water addition, effectively locking the membrane in a kinetically stable state [27]. In a recent study by Elafify, M. S. et al. it was

• addition water – this process was facilitated by the glass-transition temperature (Tg) of the polymer, marking the transition from a fluid to a glassy state. To replicate this methodology, it is important that the Tg of PSar-PBLG is high enough to freeze the different morphologies by water addition. The Tg

Facile one-pot reduction of β-nitrostyrenes to phenethylamines using sodium borohydride and copper(II) chloride

• Laura D’Andrea and
• Simon Jademyr

Beilstein J. Org. Chem. 2025, 21, 39–46, doi:10.3762/bjoc.21.4

• -consuming. Additionally, the effect of the addition order of the reagents was evaluated, and the results are also provided in Supporting Information File 1. Furthermore, methanol, 2-propanol, and water were independently tested as reaction solvents. Solubility issues, which lead to the formation of dense

• suspensions and precipitation of the starting materials, make these solvents unsuitable for this reaction and the isolation of the products troublesome. The use of 2-propanol/water (2:1), together with the application of heat, ensures optimal solubility of the species involved. Moreover, the workup procedure

Emerging trends in the optimization of organic synthesis through high-throughput tools and machine learning

• Pablo Quijano Velasco,
• Kedar Hippalgaonkar and
• Balamurugan Ramalingam

Beilstein J. Org. Chem. 2025, 21, 10–38, doi:10.3762/bjoc.21.3

• photocatalytic reactions for water molecule cleavage to produce hydrogen. The mobile robot (Figure 2b) acted as a substitute of a human experimenter by executing tasks and linking eight separate experimental stations, including solid and liquid dispensing, sonication, several characterization equipments, and

• conventional photopolymerization reactions but also helps to identify structure–property relationships for copolymer libraries. We have generated a segmented flow pattern (Figure 3b) by alternating the infusion of organic components and degassed water to create nine different compositions [53]. The organic

Reactivity of hypervalent iodine(III) reagents bearing a benzylamine with sulfenate salts

• Beatriz Dedeiras,
• Catarina S. Caldeira,
• José C. Cunha,
• Clara S. B. Gomes and
• M. Manuel B. Marques

Beilstein J. Org. Chem. 2024, 20, 3281–3289, doi:10.3762/bjoc.20.272

• )benziodoxolones (BBXs) 2 with ORTEP-3 diagram of compound 2d, using 50% probability level ellipsoids. One co-crystallized water molecule was omitted for clarity. CCDC 2368436 contains the supporting crystallographic data for this paper. Scope of the different β-sulfinyl esters 4 [32][33]. Isolated yields. rt

Giese-type alkylation of dehydroalanine derivatives via silane-mediated alkyl bromide activation

• Perry van der Heide,
• Michele Retini,
• Fabiola Fanini,
• Giovanni Piersanti,
• Francesco Secci,
• Daniele Mazzarella,
• Timothy Noël and
• Alberto Luridiana

Beilstein J. Org. Chem. 2024, 20, 3274–3280, doi:10.3762/bjoc.20.271

• , forming a new C(sp3)–C(sp3) bond. The reaction can be performed in a phosphate-buffered saline (PBS) solution and shows post-functionalization prospects through pathways involving classical peptide chemistry. Keywords: dehydroalanine; Giese-type reaction; hydroalkylation; photocatalysis; water

• decrease in product formation (38% yield, 90% conv.), meaning BP l increases the productivity of the reaction. Having established that the reaction works in CH3CN, we evaluated its compatibility with water. To our delight, the reaction in water provided full conversion and a higher yield than the one

• observed in CH3CN (58% yield, 100% conv.; Table 1, entry 3). These conditions were further refined by adding of phosphate-buffered saline and decreasing the amount of (TMS)3SiH to 1.1 equiv, as no further increase in yield was noticed during the optimization. Similar to the reaction in deionized water, all

Intramolecular C–H arylation of pyridine derivatives with a palladium catalyst for the synthesis of multiply fused heteroaromatic compounds

• Yuki Nakanishi,
• Shoichi Sugita,
• Kentaro Okano and
• Atsunori Mori

Beilstein J. Org. Chem. 2024, 20, 3256–3262, doi:10.3762/bjoc.20.269

• ), tetrabutylammonium bromide (31.7 mg, 0.098 mmol), Pd(OAc)2 (2.2 mg, 10 mol %), and triphenylphosphine (2.8 mg, 10 mol %). The mixture was dissolved in 3.1 mL of DMA and stirring was continued at 110 °C for 24 h. Then, water (3 mL) was added after cooling to room temperature. The product was extracted with

• dichloromethane (2 mL) three times. The combined organic extracts were repeatedly washed with water (20 mL) and brine (20 mL). The organic layer was dried over anhydrous sodium sulfate and concentrated under reduced pressure to give a crude material, which was purified by silica gel column chromatography (hexane

Non-covalent organocatalyzed enantioselective cyclization reactions of α,β-unsaturated imines

• Sergio Torres-Oya and
• Mercedes Zurro

Beilstein J. Org. Chem. 2024, 20, 3221–3255, doi:10.3762/bjoc.20.268

• acid as additive and a mixture of toluene and water provided the best results in terms of yield and enantioselectivity. A wide scope was explored, including electron-donating substituents and electron-withdrawing groups, as well as heterocycles, giving densely functionalized chiral azaspirocyclic

Discovery of ianthelliformisamines D–G from the sponge Suberea ianthelliformis and the total synthesis of ianthelliformisamine D

• Sasha Hayes,
• Yaoying Lu,
• Bernd H. A. Rehm and
• Rohan A. Davis

Beilstein J. Org. Chem. 2024, 20, 3205–3214, doi:10.3762/bjoc.20.266

• GeneVac XL4 centrifugal evaporator. All solvents used for chromatography, UV, MS, and [α]D were Honeywell Burdick & Jackson or Lab-Scan HPLC grade. H2O was filtered using a Sartorius Stedium Arium Pro VF ultrapure water system. Reagents used for the total synthesis of Ianthelliformisamine D were purchased

• cultures were withdrawn, and the plates were washed twice with sterile water. Then, 50 µL of diluted RSZ solution (0.2% w/v) in LB medium was added into each well followed by incubation at 37 °C for 5 h. A microplate reader (iD5 Multi-Mode) was used to measure the fluorescence intensity (excitation 530 nm

Germanyl triazoles as a platform for CuAAC diversification and chemoselective orthogonal cross-coupling

• John M. Halford-McGuff,
• Thomas M. Richardson,
• Aidan P. McKay,
• Frederik Peschke,
• Glenn A. Burley and
• Allan J. B. Watson

Beilstein J. Org. Chem. 2024, 20, 3198–3204, doi:10.3762/bjoc.20.265

• extensive scope across a range of benign solvent conditions [7][8][9][10]. In addition, the CuAAC reaction uses inexpensive Cu catalysts [11], is insensitive towards oxygen and water [12][13], and consistently delivers high yields and (where relevant) enantioselectivities [8][9][10][14][15][16][17][18][19

Synthesis of 2H-azirine-2,2-dicarboxylic acids and their derivatives

• Anastasiya V. Agafonova,
• Mikhail S. Novikov and
• Alexander F. Khlebnikov

Beilstein J. Org. Chem. 2024, 20, 3191–3197, doi:10.3762/bjoc.20.264

• -5-chloroisoxazoles [25][26][27] using anhydrous FeCl2 as a catalyst and carrying out the reaction in acetonitrile at rt for 2 h. After TLC showed the disappearance of the starting isoxazoles 1, the reaction mixture was treated with water and acids 6a–i were isolated in 64–98% yield. Isoxazole 1j did

Synthesis of extended fluorinated tripeptides based on the tetrahydropyridazine scaffold

• Thierry Milcent,
• Pascal Retailleau,
• Benoit Crousse and
• Sandrine Ongeri

Beilstein J. Org. Chem. 2024, 20, 3174–3181, doi:10.3762/bjoc.20.262

• or ester substituent. Firstly, the group of Haupt reported the synthesis of ethyl esters of tetrahydromethylpyridazine in 20% yield in a mixture of methanol and water by the reaction of methylhydrazine with acetylene dicarboxylic esters through the formation of enhydrazine (Scheme 1a), [23]. Later

Surprising acidity for the methylene of 1,3-indenocorannulenes?

• Shi Liu,
• Märt Lõkov,
• Sofja Tshepelevitsh,
• Ivo Leito,
• Kim K. Baldridge and
• Jay S. Siegel

Beilstein J. Org. Chem. 2024, 20, 3144–3150, doi:10.3762/bjoc.20.260

• derivative were also recently prepared by a mechanochemical Scholl reaction [23][24][25]. Furthermore, the anion of TBF is stable enough to be easily handled and the crystal structures of a number of common ammonium salts of TBF anion, grown from water, have been reported [26]. Neutral highly acidic

• compounds tend to deprotonate to form highly stable anions. The air stability of TBF conforms to that model. In contrast, although the dianion of BFC can be generated with tert-butoxide under inert atmosphere, in the presence of water it quenches and exposed to oxygen it oxidizes to form the diketone

• quality) was used as solvent after drying with molecular sieves (3 Å), which lowered the water content to a range of 2–6 ppm. Acids with previously published pKa values in acetonitrile were used as reference acids [12][13]. Usually this kind of ∆pKa measurements are done against three reference acids but

Hypervalent iodine-mediated intramolecular alkene halocyclisation

• Charu Bansal,
• Oliver Ruggles,
• Albert C. Rowett and
• Alastair J. J. Lennox

Beilstein J. Org. Chem. 2024, 20, 3113–3133, doi:10.3762/bjoc.20.258

• -dimethylbenziodoxole (12) as an oxidant with AgBF4 and 4 Å molecular sieves to prevent water competing with fluoride as the nucleophile, a range of unsaturated carboxylic acids were successfully cyclised to fluorinated lactones 27 in good yields. The authors proposed a mechanism for fluorolactonization (Scheme 14

Advances in the use of metal-free tetrapyrrolic macrocycles as catalysts

• Mandeep K. Chahal

Beilstein J. Org. Chem. 2024, 20, 3085–3112, doi:10.3762/bjoc.20.257

• , Ballester and co-workers reported on the preparation of an octapyridinium-based water-soluble superaryl-extended calix[4]pyrrole molecular container and used it as a capsule for desymmetrization reactions [41], where the reported compound acts both as sequestering and supramolecular protecting group. All of

• enantiomeric excess (ee) up to 5.5% [70]. Related catalytic systems based on amphiphilic 5-(cyclic-secondary-amine)-10,15,20-tris(4-sulfonatophenyl)porphyrin macrocycles 58–61 act as switchable organocatalysts for Michael and aldol reactions in water [68][69]. The macrocycles 58–61 containing different chiral

• , cyclam (tetraazacyclotetradecane), phthalocyanines, corroles and their supramolecular frameworks have been widely used as both homogeneous and heterogeneous electrocatalysts for various energy conversion and storage techniques, such as fuel cells, water splitting devices, and rechargeable metal–air

Extension of the π-system of monoaryl-substituted norbornadienes with acetylene bridges: influence on the photochemical conversion and storage of light energy

• Robin Schulte,
• Dustin Schade,
• Thomas Paululat,
• Till J. B. Zähringer,
• Christoph Kerzig and
• Heiko Ihmels

Beilstein J. Org. Chem. 2024, 20, 3061–3068, doi:10.3762/bjoc.20.254

• acetylenes at ca. 85 ppm and 95 ppm were observed. The norbornadienes 1h–l,n exhibit very good solubility in organic solvents, like ethyl acetate, chloroform, or benzene, whereas they have poor solubility in cyclohexane, acetonitrile, or ethanol. In polar protic solvents, like methanol or water, they are

Chemical structure metagenomics of microbial natural products: surveying nonribosomal peptides and beyond

• Thomas Ma and
• John Chu

Beilstein J. Org. Chem. 2024, 20, 3050–3060, doi:10.3762/bjoc.20.253

• megaenzyme machinery. Water can act as the nucleophile during the offloading step, which amounts to hydrolysis and results in a linear peptide. On the other hand, a cyclic peptide forms when an intramolecular functional group acts as the nucleophile in this step. Regardless of the resulting topology, the NRP

Cyclodextrin-based rotaxanes for polymer materials: challenge on simultaneous realization of inexpensive production and defined structures

• Yosuke Akae

Beilstein J. Org. Chem. 2024, 20, 3026–3049, doi:10.3762/bjoc.20.252

• molecule must be sufficiently long to penetrate the CD cavity and be available for the end-capping reactions, (3) the inclusion complex must dissolve appropriately, (4) the solvent must not decompose the inclusion complex (water or other polar organic solvents, such as dimethylformamide (DMF) and dimethyl

• substitution/addition reactions became the standard for end-capping reactions, although a transition metal–catalyzed cross-coupling reaction has also been used to synthesize CD-based rotaxane. Typically, water-soluble components are prepared, after which the Suzuki coupling reaction in water is used to

• synthesize the rotaxane. For example, Anderson and co-workers reported the synthesis of γ-CD–based [2]rotaxane via the Suzuki reaction using a dicarboxylic acid end-capping reagent; they reported a 17% yield (Scheme 1C) [39]. To perform an end-capping reaction in water, multiple hydrophilic substituents

Tunable full-color dual-state (solution and solid) emission of push–pull molecules containing the 1-pyrindane moiety

• Anastasia I. Ershova,
• Sergey V. Fedoseev,
• Konstantin V. Lipin,
• Mikhail Yu. Ievlev,
• Oleg E. Nasakin and
• Oleg V. Ershov

Beilstein J. Org. Chem. 2024, 20, 3016–3025, doi:10.3762/bjoc.20.251

• ], positron emission tomography (PET) imaging [24], fluorescent probes and labels [25][26][27] detecting H2S in foodstuff, water, and living cells [28], Fe3+ ions [29], Hg2+ ions [30], and cyanide anions [31], for acid–base vapor sensing [32], and as candidate material for photonics devices, optical switches

Advances in radical peroxidation with hydroperoxides

• Oleg V. Bityukov,
• Pavel Yu. Serdyuchenko,
• Andrey S. Kirillov,
• Gennady I. Nikishin,
• Vera A. Vil’ and
• Alexander O. Terent’ev

Beilstein J. Org. Chem. 2024, 20, 2959–3006, doi:10.3762/bjoc.20.249

• ]. The vicinal diols 208 were preferably obtained in water, but bisperoxides 207 were isolated in high yields using Na2CO3 as the additive, and propylene carbonate (PC) as the solvent. The reaction mechanism involves the formation of tert-butylperoxy A and tert-butoxy B radicals during the iodine

• styrenes 217, oxygen sources (water or alcohol), and TBHP mediated by ammonium iodine has been developed (Scheme 68) [137]. Addition of the tert-butylperoxy radical to alkene 217 followed by SN2 nucleophilic substitution with O-source was considered as a possible pathway to the formation of products 218

The charge transport properties of dicyanomethylene-functionalised violanthrone derivatives

• Sondos A. J. Almahmoud,
• Joseph Cameron,
• Dylan Wilkinson,
• Michele Cariello,
• Claire Wilson,
• Alan A. Wiles,
• Peter J. Skabara and
• Graeme Cooke

Beilstein J. Org. Chem. 2024, 20, 2921–2930, doi:10.3762/bjoc.20.244

• carbonate was added (300 mg, 2.04 mmol), and the reaction mixture was stirred at 100 °C overnight. After cooling the reaction mixture to room temperature, it was poured into methanol (200 mL), and the resulting precipitate was filtered, then washed with water (150 mL) to give the title compound as a dark

• ), and the resulting precipitate was filtered, then washed with water (300 mL) to give the title compound as a dark solid (1.90 g, 65%). 1H NMR (400 MHz, CDCl3) δ 8.72 (d, J = 8.0 Hz, 2H), 8.60–8.47 (m, 4H), 8.37 (d, J = 8.2 Hz, 2H), 8.27 (s, 2H), 7.80 (t, J = 7.2 Hz, 2H), 7.60 (t, J = 7.3 Hz, 2H), 4.25

• overnight. After cooling the reaction mixture to room temperature, it was poured into methanol (200 mL), and the resulting precipitate was filtered, then washed with water (150 mL) to give the title compound as a dark solid (600 mg, 71%). 1H NMR (400 MHz, CDCl3) δ 8.78 (d, J = 8.0 Hz, 2H), 8.63 (d, J = 8.3

Recent advances in transition-metal-free arylation reactions involving hypervalent iodine salts

• Ritu Mamgain,
• Kokila Sakthivel and
• Fateh V. Singh

Beilstein J. Org. Chem. 2024, 20, 2891–2920, doi:10.3762/bjoc.20.243

• absence of a base. Additionally, the presence of 40 equivalents of water proved to be crucial for the reaction, as altering the amount of water significantly impacted the product yield, indicating the importance of water in the reaction mechanism. A diverse range of functionalized diaryliodonium salts

• photosensitizer and DIPEA was effective as a base (Scheme 12). The reaction yielded the E-isomers in a solvent mixture of methanol/water 5:1 under blue LED light (467 nm) irradiation in good yields. Various DAIRs substituted at different positions were found to be suitable for the reaction giving the respective

• trifluoromethylated acrylamides 36 under environmentally friendly conditions [66]. When the reaction mixture of acrylamides 36 and diaryliodonium tetrafluoroborates 26 dissolved in water was irradiated with light of 390 nm wavelength, the desired oxindole products 37 were obtained in good yields (Scheme 14). The

Synthesis of pyrrole-fused dibenzoxazepine/dibenzothiazepine/triazolobenzodiazepine derivatives via isocyanide-based multicomponent reactions

• Marzieh Norouzi,
• Mohammad Taghi Nazeri,
• Ahmad Shaabani and
• Behrouz Notash

Beilstein J. Org. Chem. 2024, 20, 2870–2882, doi:10.3762/bjoc.20.241

• gloves with high chemical resistance. The reactions should be carried out in a hood with a strong suction and with a protective explosion shield, which in this test should be as low as possible. Since exposure to water and strong acids leads to the formation of hydrazoic acid, which is very toxic