First Stereocontrolled Synthesis of the (3S,5R,7R,10R,11R)-C1−C13 Fragment of Nystatin A1
摘要:
A convergent stereoselective synthesis of the (3S,5R,7R,10R,11R)-C1-C13 fragment of Nystatin Al is reported in this paper. This fragment contains an all-syn-1,3,5-triol subunit and a syn-1,2-diol moiety. The main features of the synthesis are the enzymatic desymmetrization of a meso diol to obtain an enantiomerically pure syn-4,6-dihydroxy-2-keto-phosphonate, chiral sulfoxide chemistry to prepare an alpha-(R)-hydroxyaldehyde and 2-trimethylsilyl thiazole reagent to synthesize a synthesize a syn-alpha,beta-(R,S)-dihydroxy aldehyde.
Enantioselective synthesis of haminol-1, an alarm pheromone of a mediterranean mollusc
摘要:
The first enantioselective synthesis of (-)-(R)-haminol-1 is described in this paper. The chiral part of the molecule was prepared by reduction of an optically active beta-ketosulfoxide. The all-trans trienic part was stereoselectively synthesized via reductive elimination of a 1,6-dibenzoate-2,4-diene with sodium amalgam. (C) 1997 Elsevier Science Ltd.
Highly stereoselective synthesis of enantiomerically pure β-hydroxy-γ-sulfenyl-γ-butyrolactone by asymmetric Pummerer type cyclization
作者:Guy Solladié、Nicole Wilb、Claude Bauder
DOI:10.1016/s0040-4039(00)00562-1
日期:2000.5
Enantiomericallypure t-butyl 4-sulfinyl-3-silyloxy-butanoate can be transformed stereoselectively in a Pummerer reaction with TFAA into the usual aldehyde or into a cis β-hydroxy-γ-sulfenyl-γ-butyrolactone. Experimental conditions allowing total control of the reaction in favor of either the aldehyde or the γ-butyrolactone are described. The corresponding methyl butanoate led, under the same conditions