One-pot synthesis of carbamates and thiocarbamates from Boc-protected amines
作者:Hee-Kwon Kim、Anna Lee
DOI:10.1016/j.tetlet.2016.09.038
日期:2016.11
A highly efficient one-pot procedure for the synthesis of carbamates and thiocarbamates has been described. In the presence of 2-chloropyridine and trifluoromethanesulfonyl anhydride, the isocyanate intermediates were generated in situ for further reactions with alcohols and thiols to afford the desired carbamates and thiocarbamates in high yields.
Abstract Dichloromethyl carbonates, easily available upon treatment alcohols with dichloromethyl chloroformate, react with various amines to give carbamates in high yield under mild conditions. Extension of the reaction for the synthesis of oxazolones from 2-aminoalcohols is also demostrated.
Efficient Cs2CO3-promoted solution and solid phase synthesis of carbonates and carbamates in the presence of TBAI
作者:Ralph N Salvatore、Feixia Chu、Advait S Nagle、Elona A Kapxhiu、Richard M Cross、Kyung Woon Jung
DOI:10.1016/s0040-4020(02)00286-7
日期:2002.4
Novel solution and solid-phase methods for the synthesis of carbonates and carbamates were developed using cesium bases and TBAI via a three-component coupling. Cesium carbonate not only promoted successful carbonylations of alcohols and carbamations of amines, but also suppressed common side reactions traditionally seen using existing protocols. Various alcohols and amines were examined, using a wide
An efficient one-pot synthesis of N,N′-disubstituted ureas and carbamates from N-acylbenzotriazoles
作者:Anoop S. Singh、Dhananjay Kumar、Nidhi Mishra、Vinod K. Tiwari
DOI:10.1039/c6ra14131e
日期:——
A facile and high-yielding one-pot synthesis of carbamates and N,N'-disubstituted symmetrical ureas from N-acylbenzotriazoles has been devised. It is believed that, the intermediate acyl-azide undergo Curtius rearrangement and under different...
[EN] PREPARATION OF ß-PHENYL-ISOSERINE DERIVATIVES<br/>[FR] PRÉPARATION DE DÉRIVÉS DE ?-PHÉNYL-ISOSÉRINE
申请人:ORGANOCLICK AKTIEBOLAG
公开号:WO2010024762A1
公开(公告)日:2010-03-04
A process for stereoselective synthesis of a β-phenylisoserine comprises reacting a carbonyl imine R-C=N-CO-OR1 with a protected α- oxyaldehyde X1O-CH2CHO in the presence of a chiral amine catalyst and oxidizing aldehyde so obtained.