Enzymatic Resolution of α-acetoxysulfides: A new approach to the synthesis of homochiral S,O-Acetals
摘要:
A novel enzymatic resolution of alpha-acetoxysulfides using Pseudomonas fluorescens lipase is reported. Selectivity is highly dependent on the substrate and solvent, with enantiomeric excesses of >95% in some cases. We believe these are the first examples of enzymatic resolutions of an S,O-acetal.
Enantioselective enzymatic synthesis of the anti-viral agent lamivudine (3TC™)
作者:John Milton、Stephen Brand、Martin F. Jones、Christopher M. Rayner
DOI:10.1016/0040-4039(95)01380-z
日期:1995.9
A novel enzymatic resolution of alpha-acetoxysulfides has been used as the key step in the synthesis of the important antiviral nucleoside analogue lamivudine. The synthesis proceeds via a configurationally stable hemithioacetal which cyclises in situ to form the required oxathiolane nucleus, which can then be converted into the target nucleoside in 4 steps.