Stereoselective synthesis of the C1–C12 subunit of (−)-callystatin A
摘要:
A stereoselective synthesis of the C1-C12 fragment of callystatin A is disclosed. The two stereocenters at C5 and C10 were created by an organocatalytic reaction and a diastereoselective alkylation, respectively. The trisubstituted double bond was introduced by a hydroxy directed hydrostannylation followed by the Negishi reaction. The lactone ring resulted from a ring-closing metathesis reaction. (C) 2015 Elsevier Ltd. All rights reserved.