Visible-light-driven switchable divergent di- or tricarboxylation of allylic alcohols with CO is realized to selectively upgrade multiple CO units to polycarboxylic acids. The derivatization of corresponding polycarboxylic acids could deliver the potential functional materials in luminescence and biomaterials.
α-Alkylidene-γ-butyrolactone synthesis via one-pot C–H insertion/olefination: substrate scope and the total synthesis of (±)-cedarmycins A and B
作者:Matthew G. Lloyd、Mariantonietta D'Acunto、Richard J.K. Taylor、William P. Unsworth
DOI:10.1016/j.tet.2014.09.054
日期:2015.9
A system for the synthesis of alpha-alkylidene-gamma-butyrolactones via a one-pot C-H insertion/olefination sequence is described. The process is based on the rhodium catalysed C-H insertion reaction of alpha-diazoa-(diethoxyphosphoryl)acetates. The mild reaction conditions, operational simplicity and ready availability of starting materials are all key features. A wide range of successful reaction systems are reported (41 examples) highlighting the generality of the method. The application of this method in the total synthesis of the natural products (+/-)-cedarmycins A and B is also described. (C) 2014 Elsevier Ltd. All rights reserved.
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