A Formal Total Synthesis of Palmerolide A

An efficient formal total synthesis of the marine natural product palmerolide A is reported herein, involving 24 longest linear steps. The key features of our synthesis involve a combination of Sharpless epoxidation and Shimizu reaction to construct the syn aldol moiety, a Julia–Kocienski reaction to construct the diene, and ring-closing metathesis to form the macrocycle.