Construction of functionalised medium rings by stereospecific expansions of 2,3-epoxy alcohols under mild conditions
摘要:
Ketones are converted with very high stereocontrol into functionalised medium rings incorporating a P-hydroxy ketone assembly via a ring-expansion mediated by tin(IV) chloride at low temperatures; either the threo or the erythro aldol products can be obtained. An asymmetric epoxidation permitted a subsequent highly enantiocontrolled semi-pinacol rearrangement. (C) 2002 Elsevier Science Ltd. All rights reserved.
Construction of functionalised medium rings by stereospecific expansions of 2,3-epoxy alcohols under mild conditions
摘要:
Ketones are converted with very high stereocontrol into functionalised medium rings incorporating a P-hydroxy ketone assembly via a ring-expansion mediated by tin(IV) chloride at low temperatures; either the threo or the erythro aldol products can be obtained. An asymmetric epoxidation permitted a subsequent highly enantiocontrolled semi-pinacol rearrangement. (C) 2002 Elsevier Science Ltd. All rights reserved.