Formaldehyde surrogates in multicomponent reactions

• Cecilia I. Attorresi,
• Javier A. Ramírez and
• Bernhard Westermann

Beilstein J. Org. Chem. 2025, 21, 564–595, doi:10.3762/bjoc.21.45

• for obtaining propargylamines. Synthesis of α-aminophosphonates One of the most robust methods for the synthesis of α-aminophosphonates is the Pudovik reaction, along with its multicomponent version, the Kabachnik–Fields reaction (Scheme 25) [72][73]. In the Pudovik reaction, a dialkyl phosphite 31

• is a very interesting alternative for the synthesis of P-chiral α-aminophosphorous compounds without formaldehyde due to the straightforward procedure, the good yields observed, and the absence of byproducts compared to more conventional methods (Pudovik reaction or Kabachnik–Fields MCR reaction) [72

Organophosphorus chemistry: from model to application

• György Keglevich

Beilstein J. Org. Chem. 2023, 19, 89–90, doi:10.3762/bjoc.19.8

• . elaborated a Lewis acid-catalyzed one-pot synthesis of phosphinates and phosphonates staring from pyridinecarboxaldehydes and diarylphosphine oxides [2]. This protocol is the analogy of the Pudovik reaction, followed by the phospha-Brook rearrangement applied mainly for the synthesis of phosphoric ester

Lewis acid-catalyzed Pudovik reaction–phospha-Brook rearrangement sequence to access phosphoric esters

• Jin Yang,
• Dang-Wei Qian and
• Shang-Dong Yang

Beilstein J. Org. Chem. 2022, 18, 1188–1194, doi:10.3762/bjoc.18.123

• Herein, we report a Lewis acid-catalyzed Pudovik reaction–phospha-Brook rearrangement sequence between diarylphosphonates or -phosphinates and α-pyridinealdehydes to access valuable phosphoric ester compounds. This transformation provides an extended substrate scope that is complementary to similar

• previously reported base-catalyzed transformations. Keywords: Lewis acid; phospha-Brook rearrangement; phosphoric esters; Pudovik reaction; Introduction Phosphoric esters are widely used in agrochemistry, biological sciences, clinical treatments, as well as in general organic transformations [1][2][3][4][5

• can be easily prepared by Pudovik reaction (addition of an unsaturated carbonyl compound to a labile P–H bond), to undergo an efficient intramolecular rearrangement, producing phosphoric esters [31][32][33][34][35][36][37][38][39][40][41][42]. For example, in 2005, Kaïm and co-workers have

Synthetic strategies of phosphonodepsipeptides

• Jiaxi Xu

Beilstein J. Org. Chem. 2021, 17, 461–484, doi:10.3762/bjoc.17.41

• tetraoxyspirophosphoranes to imines The addition reaction of the P–H bond of tetraoxyspirophosphoranes 199 to long-chain imines 200 of benzaldehyde, acetaldehyde, and dodecanal at room temperature generated the corresponding (α-aminoalkyl)spirophosphoranes 201 via the Pudovik reaction. The one-pot selective hydrolysis of

Efficient synthesis of dipeptide analogues of α-fluorinated β-aminophosphonates

• Marcin Kaźmierczak and
• Henryk Koroniak

Beilstein J. Org. Chem. 2020, 16, 756–762, doi:10.3762/bjoc.16.69

• studies, the Pudovik reaction worked with satisfactory yield and diastereoselectivity [30]. Unfortunately, we were not able to isolate the pure anti-isomer in every case. The latest research shows that this reaction can successfully be carried out under milder conditions, without any solvent and in the

• Pudovik reaction, but also improved its yield drastically (Table 1). The implementation of this allowed us to obtain the anti-isomer (1R,2S) in very good yields. There are not many literature examples of the regioselective fluorination of amino alcohols using by PyFluor (1) or PBSF (2). In general, the

Microwave-assisted synthesis of N,N-bis(phosphinoylmethyl)amines and N,N,N-tris(phosphinoylmethyl)amines bearing different substituents on the phosphorus atoms

• Erika Bálint,
• Anna Tripolszky,
• László Hegedűs and
• György Keglevich

Beilstein J. Org. Chem. 2019, 15, 469–473, doi:10.3762/bjoc.15.40

• elaborated by us for the synthesis of several (aminomethyl)phosphine oxides [10][11]. As regards α-aminophosphine oxides with different P-substituents, only two different types were reported. Olszewski and co-workers synthesized chiral thiazole-substituted aminophosphine oxides 2 through the Pudovik reaction

Phosphonic acid: preparation and applications

• Charlotte M. Sevrain,
• Mathieu Berchel,
• Hélène Couthon and
• Paul-Alain Jaffrès

Beilstein J. Org. Chem. 2017, 13, 2186–2213, doi:10.3762/bjoc.13.219

• reaction between di-tert-butyl phosphite and either benzyl halide [137] (Michaelis–Becker reaction) or aldehyde [134] (Pudovik reaction) or using tris-tert-butyl phosphite (Abramov reaction) [135]. The elimination of the t-Bu moieties can be efficiently achieved in presence of trifluoroacetic acid (TFA

The synthesis of α-aryl-α-aminophosphonates and α-aryl-α-aminophosphine oxides by the microwave-assisted Pudovik reaction

• Erika Bálint,
• Ádám Tajti,
• Anna Ádám,
• István Csontos,
• Konstantin Karaghiosoff,
• Mátyás Czugler,
• Péter Ábrányi-Balogh and
• György Keglevich

Beilstein J. Org. Chem. 2017, 13, 76–86, doi:10.3762/bjoc.13.10

• was evaluated by DFT calculations. Two α-aminophosphonates were subjected to an X-ray study revealing a racemic dimer formation made through a N–H···O=P intermolecular hydrogen bridges pair. Keywords: α-aryl-α-aminophosphine oxides; α-aryl-α-aminophosphonates; microwave; Pudovik reaction

• -aminophosphonate derivatives embrace the Kabachnik–Fields (phospha-Mannich) three-component condensation, where an amine, an aldehyde or ketone and a >P(O)H reagent, such as a dialkyl phosphite or a secondary phosphine oxide react in a one-pot manner [6][7][8][9][10], and the Pudovik (aza-Pudovik) reaction, in

• aminophosphine oxide 2e was obtained in a yield of 89% (Table 1, entry 11). Next N-benzylidene(cyclohexyl)amine (1b) was tried in the aza-Pudovik reaction (Table 2). Its reaction with 1.2 equivalents of DMP at 80 °C for 30 min led to aminophosphonate 4a at a conversion of 89% (Table 2, entry 1). Even at 100 °C

Multicomponent reactions: A simple and efficient route to heterocyclic phosphonates

• Mohammad Haji

Beilstein J. Org. Chem. 2016, 12, 1269–1301, doi:10.3762/bjoc.12.121

• -dihydropyridinylphosphonates during their studies of the base-catalyzed Pudovik reaction [91]. Unlike most other bases, the pyridine-mediated reaction of ethyl propiolate (253) and dialkyl phosphonates 254 led to 1,2-dihydropyridinylphosphonates 256. Thus, the 1,2-dihydropyridinylphosphonates 256 were synthesized via a one

Synthesis, fluorescence properties and the promising cytotoxicity of pyrene–derived aminophosphonates

• Jarosław Lewkowski,
• Maria Rodriguez Moya,
• Anna Wrona-Piotrowicz,
• Janusz Zakrzewski,
• Renata Kontek and
• Gabriela Gajek

Beilstein J. Org. Chem. 2016, 12, 1229–1235, doi:10.3762/bjoc.12.117

• , University of Łódź, Banacha 12/16, 90-237 Łódź, Poland 10.3762/bjoc.12.117 Abstract A large series of variously substituted amino(pyren-1-yl)methylphosphonic acid derivatives was synthesized using a modified aza-Pudovik reaction in 20–97% yields. The fluorescence properties of the obtained compounds were

• further reaction without purification. Aminophosphonates 3Aa–h, 3Ba–e and 3Ca–d, 3Cg have been synthesized via an aza-Pudovik reaction [22], i.e., the addition of the appropriate phosphite 2A–C to the azomethine bond of the Schiff bases 1a–h. Nevertheless, the important modifications had to be introduced

• conditions to prepare N-(pyren-1-ylidene)-tert-butylamine (1j) and dimethyl N-(tert-butyl)amino(pyren-1-yl)methylphosphonate (3Aj) via the aza-Pudovik reaction, the Kabachnik–Fields reaction was used as an alternative method [23]. The three-component reaction without any catalyst was carried out first in