The proposed structure of natural flavolipin was revised as N-[N-[(3R)-15-methyl-3-(13-methyltetradecanoyloxy)hexadecanoyl]glycyl]-L-serine as a result of synthetic study and biological activity test.
Topostins B567 (2b) and D654 (3b) (WB-3559D, flavolipin) have been efficiently synthesized from 1,10-decanediol (5) in 11 and 13 steps, respectively, involving an asymmetric hydrogenation of the beta-keto ester 14 using (R)-BINAP ruthenium bromide and a peptide coupling using diethyl phosphorocyanidate (DEPC, (EtO)(2)P(O)CN) as key steps. (C) 1998 Published by Elsevier Science Ltd. All rights reserved.