Herein, we describe an efficient strategy for the total synthesis of (+)-negamycin using commercially available achiral N-Boc-2-aminoacetaldehyde as starting material with 42% overall yield for a limited number of steps.
Multiple contiguous chiralcenters were constructed in one pot using three types of multistep reactions initiated with the Michael addition of N-benzyl-2(R)-methoxy-(+)-10-bornylamide to α,β-unsaturated esters, i.e., asymmetric Michael−aldol reaction, double Michael addition, and double Michael−aldol reaction. The chiral 2-methoxy-10-bornyl group as well as the benzyl group on the amino group of the