Allylic fluorination via an unusual alkene Z/E isomerisation
摘要:
The isomerisation of readily available (Z)-4-(para-methoxybenzyloxy)- 1 -chloro-2-butene was achieved under mild conditions to afford the much less accessible E-diastereoisomer. This was an effective Substrate in Sharpless asymmetric dihydroxylation (AD) reactions, delivering highly enantiomerically enriched fluorinated butene triol building blocks. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Regio- and Enantioselective Fluorination of Acyclic Allylic Halides
作者:Matthew H. Katcher、Allen Sha、Abigail G. Doyle
DOI:10.1021/ja206960k
日期:2011.10.12
This report describes the Pd(0)-catalyzed fluorination of linear allylic chlorides and bromides, yielding branched allylic fluorides in high selectivity. Many of the significant synthetic limitations previously associated with the preparation of these products are overcome by this catalytic method. We also demonstrate that a chiral bisphosphine-ligated palladium catalyst enables highly enantioselective