An unprecedented synthesis of γ-lactams via mercaptoacetylation of aziridines in water
作者:Vijai K. Rai、Prashant Kumar Rai、Swati Bajaj、Anil Kumar
DOI:10.1039/c0gc00899k
日期:——
A highly green and expeditious route to α-mercapto-γ-lactams from masked mercapto acids viz. 2-phenyl-2-methyl-1,3-oxathiolan-5-ones, and tosyl aziridines in an excellent yield (82â93%) is reported. The synthetic protocol involves regioselective opening of the terminal aziridine ring and mercaptoacetylative cyclisation cascades in a one-pot procedure wherein water acts as both a catalyst as well as a solvent. These reactions were carried out in aqueous media as well as under solvent-free conditions, however, under solvent-free conditions, lower yields are obtained.
An efficient and new approach has been developed to synthesize bis(β,β'-dialkoxy carbonyl) derivatives through the reaction between N-tosylaziridines and malonate esters under ambient air using tBuOK in DMSO solvent. A plausible reaction pathway has been predicted. Control experiments suggested that the reactions proceed through the formation of α-aminoketones. This reaction offers a broad substrate
A Synthetic Route to Chiral 1,4-Disubstituted Tetrahydro-β-Carbolines via Domino Ring-Opening Cyclization of Activated Aziridines with 2-Vinylindoles
作者:Masthanvali Sayyad、Imtiyaz Ahmad Wani、Raja Babu、Yerramsetti Nanaji、Manas K. Ghorai
DOI:10.1021/acs.joc.6b02719
日期:2017.3.3
for the synthesis of various 1,4-disubstituted tetrahydro-β-carbolines with excellent stereoselectivity (de, ee up to >99%) via domino ring opening cyclization (DROC) of activated aziridines with 2-vinylindoles is described. The reaction proceeds through LiClO4-catalyzed Friedel–Crafts-type alkylation of 2-vinylindoles with activated aziridines followed by an intramolecular aza-Michael reaction in a domino
Trifluoromethylation of Disubstituted Morpholines by Metal-Free Visible Light Photoredox Catalysis
作者:Vishal Srivastava、Pravin K. Singh、Praveen P. Singh
DOI:10.14233/ajchem.2016.19893
日期:——
A mild and efficient one-pot visible light-induced method has been developed for the trifluoromethylation of disubstituted morpholines. This method includes synthesis of substituted 4-tosyl-5-[(trifluoromethyl)thio]morpholine 4(a-l) from tosylaziridine 1(a-l) and oxiran-2-thiol (2) in presence of eosin Y as an organophotoredox catalyst at room temperature under aerobic condition.
Accessing Quinoxalines by Ring-Opening/Cyclization/Detosylation/Aromatization of Activated Aziridines with 2-Bromoanilines: Synthesis of Tyrphostin AG 1296
作者:Chandan Kumar Shahi、Sajan Pradhan、Aditya Bhattacharyya、Raushan Kumar、Manas K. Ghorai
DOI:10.1002/ejoc.201700506
日期:2017.6.30
Synthesis of substituted 2-arylquinoxalines via an unprecedented Cu(I) catalyzed ring-opening-cyclization followed by detosylation-aromatization of activated aziridines with 2-bromoanilines has been accomplished. The transformation efficiently accommodates a wide range of aziridines and 2-bromoanilines to afford the desired quinoxaline frameworks in excellent yields (up to 86%) as a single regioisomer