Synthesis of Phakellistatin 11: A Micronesia (Chuuk) Marine Sponge Cyclooctapeptide
作者:George R. Pettit、John W. Lippert、Stuart R. Taylor、Rui Tan、Michael D. Williams
DOI:10.1021/np0100441
日期:2001.7.1
elongation of the octapeptide was performed until the final unit Pro was added. The allyl ester was removed using Pd(0)[P(C(6)H(5))(3)](4). Cleavage of the final Fmoc group and cyclization with PyAOP provided phakellistatin 11 (1) in 17% overall yield. The synthetic specimen of phakellistatin 11 (1) was found to be chemically but not biologically (cancer cell lines) identical to the natural product. The
使用固相技术合成了密克罗尼西亚联邦(Chuuk)海洋海绵Phakellia sp。的组成部分环八肽phakellistatin 11(1)。事实证明,由于七肽阶段Fmoc基团的自发脱保护作用,最初的溶液相合成是不充分的。使用PAL树脂连接并从Fmoc-Glu-α-烯丙基酯开始,进行八肽的线性延伸,直到添加最终单元Pro。使用Pd(0)[P(C(6)H(5))(3)](4)除去烯丙基酯。切割最终的Fmoc组并用PyAOP环化提供了phakellistatin 11(1),总产率为17%。发现phakellistatin 11(1)的合成标本与天然产物在化学上相同,但在生物学上(癌细胞系)却不同。