Stereoselective syntheses of γ-alkyl (aryl)-α,β-dihydroxy-γ-butyrolactones and naturally occurring lipid guggultetrol
摘要:
gamma-Oxo-butyramides derived from tartaric acid serve as excellent precursors for the synthesis of gamma-alkyl (aryl)-alpha,beta-dihydroxy-gamma-butyrolactones and for the synthesis of tetrols containing three contiguous stereogenic centres. The methodology presented here is general for the synthesis of gamma-alkyl (aryl)-alpha,beta-dihydroxy-gamma-butyrolactones. Utility of the chiral building block was demonstrated by the synthesis of naturally occurring lipid guggultetrol. (c) 2006 Elsevier Ltd. All rights reserved.
Hydroxylation of and halogen addition to the carbon carbon double bond of ()-2-hydroxy-3-enoic acids
作者:Hongtao Yu、Helmut Simon
DOI:10.1016/s0040-4020(01)86507-8
日期:1991.11
Various ()-2-hydroxy-3-enoic acids and their derivatives have been subjected to epoxidations with peracids, dihydroxylations with osmiumtetroxide or methylrhenium trioxide. Depending on the derivatives and reagents applied, the diastereomeric excesses (de) achieved were in the range of 8–80%. Based on the different addition mechanisms of osmiumtetroxide and methylrhenium trioxide, all four possible