Enantiospecific synthesis of substituted 1-norbornyl trifluoromethanethiosulfonates and 1-norbornanethiols
摘要:
New homochiral 1-norbomylthiotriflates 6 and 7 and 1-norbomanethiols 8 and 9 are easily prepared starting from naturally occurring 2-norbomanones 1. The key step is the reaction of chiral 2-norbomanethiones 2 with Tf2O under mild conditions. (C) 1997 Published by Elsevier Science Ltd.
A short and convenient procedure for the stereoselective synthesis of novel optically active 2-hydroxy-1-norbornanesulfonamides starting from commercially available natural camphor and fenchone is reported. The synthetic route involves a nucleophilic substitution at the sulfenyl sulfur atom of 2-methylene-1-norbornylthiotriflates followed by oxidation of the intermediate sulfenamides and highly diastereoselective reduction of the carbonyl group of the parent 2-oxo-1-norbornanesulfonamides. (C) 2003 Elsevier Ltd. All rights reserved.