Total synthesis of cyclodepsipeptide Hikiamides A-C / 中国药科大学学报

ABSTRACT

@#Total synthesis of cyclodepsipeptide Hikiamides A-C was described. Fragment convergent condensation method was applied for the preparation of Hikiamides A-C, starting from Commercially available amino acid such as L-N-Boc-Phe-OH, L-N-Boc-Trp-OH, L-N-Cbz-Van-OH etc. Tripeptide fragments(compounds 5a/5b)and dipeptide fragments(compounds 8a/8b)were first prepared. The subsequent condensation of the resulted two fragments provided protected linear pentapetides(compounds 9a/9b/9c); Finally, the linear pentapetide was cyclized by a mixed condensing agents comprised of PyBOP and HBTU. Hikiamides A-C was obtained with total yields of 9%, 11% and 6. 5%, respectively. Compared with the natural source, this method has the advantages of low cost, convenient operation and high yield, which effectively solves the problem of low isolated yield of Hikiamides A-C from Fusarium sp.