Surfactant catalyzed convenient and greener synthesis of tetrahydrobenzo[a]xanthene-11-ones at ambient temperature

• Pravin V. Shinde,
• Amol H. Kategaonkar,
• Bapurao B. Shingate and
• Murlidhar S. Shingare

Beilstein J. Org. Chem. 2011, 7, 53–58, doi:10.3762/bjoc.7.9

• ]xanthen-11-one using tetradecyltrimethylammonium bromide (TTAB) at room temperature in water is described. Keywords: green chemistry; in-water synthesis; surfactant; tetradecyltrimethylammonium bromide (TTAB); xanthene; Introduction The development of novel synthetic methodologies to facilitate the

Novel tetracyclic structures from the synthesis of thiolactone-isatin hybrids

• Renate Hazel Hans,
• Hong Su and
• Kelly Chibale

Beilstein J. Org. Chem. 2010, 6, No. 78, doi:10.3762/bjoc.6.78

• against the condensing enzymes of type II fatty acid synthesis which operate in a number of pathogenic organisms [6][7][8]. Synthetic methodologies for 1 and a series of racemic and enantiopure thiolactomycin-based analogues have been reported [9][10][11][12][13][14][15][16]. Of particular interest to

(Pseudo)amide-linked oligosaccharide mimetics: molecular recognition and supramolecular properties

• José L. Jiménez Blanco,
• Fernando Ortega-Caballero,
• Carmen Ortiz Mellet and
• José M. García Fernández

Beilstein J. Org. Chem. 2010, 6, No. 20, doi:10.3762/bjoc.6.20

• aminocyclopentitol rings. Trehazolin is a potent trehalase inhibitor in which an aminocyclopentitol ring replaces the glucopyranosyl cation postulated as an intermediate in the enzymatic hydrolysis of α,α-trehalose. Although several synthetic methodologies had successfully been applied to prepare this inhibitor

• synthetic methodologies for thioureido and ureido glycooligomers have made thus enabling the preparation of virtually any oligomeric structure (linear, branched, dendritic and cyclic). The secondary structures adopted by these pseudooligosaccharides have been extensively studied by current NMR and molecular

Synthesis of a new class of aminocyclitol analogues with the conduramine D-2 configuration

• Latif Kelebekli,
• Yunus Kara and
• Murat Celik

Beilstein J. Org. Chem. 2010, 6, No. 15, doi:10.3762/bjoc.6.15

• of carbohydrate mimetics, which can be potent inhibitors of glycosidase (1–4) [11][12][13][14][15][16], we have developed a method for rapid entry to these compounds. Antibiotics containing an aminocyclitol unit have stimulated the development of synthetic methodologies [16] in the search for

A divergent asymmetric approach to aza-spiropyran derivative and (1S,8aR)-1-hydroxyindolizidine

• Jian-Feng Zheng,
• Wen Chen,
• Su-Yu Huang,
• Jian-Liang Ye and
• Pei-Qiang Huang

Beilstein J. Org. Chem. 2007, 3, No. 41, doi:10.1186/1860-5397-3-41

• of enantiomeric malimide-based synthetic methodologies, [35][36][37][38] we now report concise and highly diastereoselective syntheses of an aza-spiropyran derivative 7 and (1S,8aR)-1-hydroxyindolizidine (ent-3). Results and discussion Previously, we have shown that the addition of Grignard reagents

High stereoselectivity on low temperature Diels- Alder reactions

• Luiz Carlos da Silva Filho,
• Valdemar Lacerda Júnior,
• Mauricio Gomes Constantino,
• Gil Valdo José da Silva and
• Paulo Roberto Invernize

Beilstein J. Org. Chem. 2005, 1, No. 14, doi:10.1186/1860-5397-1-14

• studies [8][9][10][11] that demonstrated how large the influence of the Lewis acid can have on several aspects of the reactions. As part of our research work on synthetic methodologies using niobium pentachloride in a variety of reactions [12][13][14], we have recently started an investigation on