Stereocontrolled synthesis of novel phytosphingosine-type glucosaminocerebrosides
摘要:
D-ribo-Phytosphingosine 1 was conveniently synthesized from N-benzoyl-D-glucosamine 3 by an improved route in which regioselective O-methanesulfonation and diastereoselective Grignard addition are involved as key steps. Using a synthetic intermediate of 1, novel D-ribo-phytosphingosinetype glycolipids 2a and 2b, unnatural homologues of antifungal cerebrosides Halicylindrosides, were efficiently synthesized in a stereocontrolled manner. (C) 1999 Elsevier Science Ltd. All rights reserved.
The use of (S)-(−)-1-(1-naphthyl)ethylamine as a resolving agent for α-methoxy fatty acids
作者:Néstor M. Carballeira、Roberto Colón
DOI:10.1016/s0957-4166(99)00404-8
日期:1999.9
A general method was developed for the diastereoselective resolution of α-methoxy fatty acids utilizing (S)-(−)-1-(1-naphthyl)ethylamine as resolvingagent. The diastereomeric amides can be easily separated by silica gel column chromatography and/or capillary gas chromatography, thus allowing for a preparative and analytical method for determining the enantiomeric purity of naturally occurring and/or