作者:Steven D. Bull、Stephen G. Davies、Richard M. Parkin、Francisco Sánchez-Sancho
DOI:10.1039/a802702a
日期:——
Investigations reveal that the structures assigned to D-α-amino acid containing diketopiperazines (DKPs) 21–25 isolated from the sponge Calyx CF. podatypa have been reported incorrectly. Synthetic studies and comparison with literature data have enabled the structures of these DKPs to be correctly reassigned. Evidence is presented to suggest that naturally occurring D-Pro-L-Xxx-DKPs are artifacts resulting from non-enzymatic epimerisation of the corresponding L-Pro-L-Xxx-DKP natural products.
调查显示,从海绵Calyx CF. podatypa中分离出的含D-α-氨基酸的二酮哌嗪(DKPs)21–25所指定的结构被错误报告。合成研究和与文献数据的比较使得这些DKPs的结构得以正确重新分配。证据表明,自然发生的D-Pro-L-Xxx-DKPs是由相应的L-Pro-L-Xxx-DKP天然产物的非酶异构化所产生的伪产物。