A Flexible Approach to Azasugars: Asymmetric Total Syntheses of (+)-Castanospermine, (+)-7-Deoxy-6-<i>epi</i>-castanospermine, and (+)-1-<i>epi</i>-Castanospermine
The asymmetric total synthesis of natural azasugars (+)‐castanospermine, (+)‐7‐deoxy‐6‐epi‐castanospermine, and synthetic (+)‐1‐epi‐castanospermine has been accomplished in nine to ten steps from a common chiral building block (S)‐8. The method features a powerful chiral relay strategy consisting of a highly diastereoselective vinylogous Mukaiyama‐type reaction with either chiral or achiral aldehydes
Process for the preparation of oxazolidinones and method of use thereof
申请人:Hollingsworth I. Rawle
公开号:US20070265451A1
公开(公告)日:2007-11-15
A process for preparing N-(substituted)-C-(substituted methyl)-oxazolidinones, C-(substituted methyl)-oxazolidinones, and N-(substituted)-C-(substituted methyl)-oxazolidinones, preferably chiral, from optically active C-(protected oxymethyl)-oxazolidinones is described. The process can be used to produce combinatorial libraries of the above substituted oxazolidinones in a two or three step reaction comprising a plurality of reagents differing in numbers of carbons or particular substituted oxazolidinones. A number of substituted oxazolidinones produced using the above process have been discovered to have antimicrobial activity.
PROCESS FOR THE PREPARATION OF OXAZOLIDINONES AND METHOD OF USE THEREOF
申请人:Hollingsworth Rawle I.
公开号:US20080146458A1
公开(公告)日:2008-06-19
Substituted oxazolidinone of the formula:
wherein R
2
is alkyl selected from the group consisting of methyl, ethyl, and isopropyl moieties, are described. The compounds are antibacterial.
Stereoselection in Radical Cyclization of β-Alkoxyvinyl Sulfoxides: Synthesis of Tetrahydrofuranyl Allyl Carbinols
作者:Gyochang Keum、Soon Bang Kang、Youseung Kim、Eun Lee
DOI:10.1021/ol049676f
日期:2004.6.1
Tetrahydrofuranyl allyl carbinols may be prepared stereoselectively via radical cyclization of beta-alkoxyvinyl sulfoxides, Pummerer rearrangement, and reaction with allylstannane.