A Concise Total Synthesis of Pyrovellerolactone Using a Rhodium-Catalyzed [(3 + 2) + 2] Carbocyclization Reaction
作者:P. Andrew Evans、Phillip A. Inglesby、Kathryn Kilbride
DOI:10.1021/ol400165x
日期:2013.4.19
The key step involves a regio- and diastereoselective rhodium-catalyzed [(3 + 2) + 2] carbocyclization of an alkenylidenecyclopropane with a 4-hydroxybut-2-ynoate followed by an in situ intramolecular lactonization to generate the tricyclic core in a single operation. This represents the first example of a higher-order [3 + 2 + 2] carbocyclization reaction in total synthesis, which is likely to provide