Stereoselective total synthesis of (-)-batzellasides a, b, and c

摘要

Total synthesis of (-)-L-batzellasides A, B, and C has been achieved in 13 steps from known lactone 2 in 12.6, 13.2, and 13.8 % overall yields, respectively. The key steps in this synthesis were the stereoselective introduction of an allyl group at the C1 position by acyliminium chemistry and Brown's asymmetric allylation of the corresponding aldehydes to construct a stereocenter on the side chain.