Nicholas Reactions with Carboxylic Acids for the Synthesis of Macrocyclic Diolides
作者:Kevin M. Shea、Kristina D. Closser、Miriam M. Quintal
DOI:10.1021/jo051691q
日期:2005.10.1
[GRAPHIC]We have developed a new strategy for the preparation of diolides using a cascade of Nicholas reactions. The carboxylic acid nucleophiles in these reactions are virtually unstudied participants in transformations of this type. Using this methodology, a 16-membered cobalt-complexed cyclic diyne is available in 28% yield over eight steps (an average of 85% per step). We can also easily access the uncomplexed diolide in one additional step.