Stereoselective Synthesis of Oxazolidin-2-ones via an Asymmetric Aldol/Curtius Reaction: Concise Total Synthesis of (−)-Cytoxazone
作者:Hosam Choi、Hanho Jang、Joohee Choi、Kiyoun Lee
DOI:10.3390/molecules26030597
日期:——
approach toward the synthesis of 4,5-disubstituted oxazolidin-2-one scaffolds. The developed approach is based on a combination of an asymmetric aldol and a modified Curtius protocol, which uses an effective intramolecular ring closure to rapidly access a range of oxazolidin-2-one building blocks. This strategy also permits a straightforward and concise asymmetric totalsynthesis of (−)-cytoxazone. Consisting
作者:Miguel Carda、Florenci González、Richard Sánchez、J.Alberto Marco
DOI:10.1016/s0957-4166(02)00227-6
日期:2002.6
The stereoselective synthesis of the cytokinemodulator (−)-cytoxazone in enantiopure form is described. Key steps of the process are a syn-stereoselective aldol addition of a chiral ketone mediated by chlorodicyclohexylborane, and a Curtius rearrangement.
A new synthesis of cytoxazone and its diastereomers provides key initial SAR information
作者:Percy H. Carter、Jacob R. LaPorte、Peggy A. Scherle、Carl P. Decicco
DOI:10.1016/s0960-894x(03)00131-8
日期:2003.4
A short, enantioselective, and diastereoselective synthesis of cytoxazone, a Th2-selective immunomodulator from Streptomyces, is described. The route was readily adapted to the synthesis of the three other stereoisomers of natural cytoxazone. Evaluation of these compounds revealed that the stereochemical configuration of the oxazolidinone ring did not influence their biological activity. (C) 2003 Elsevier Science Ltd. All rights reserved.