14-membered tetrapeptide core. The initially reported biological data and intriguing structure, which was without full stereochemical identification, necessitated synthesis of both nominal (all-S) cyclocinamide A and the 11R isomer. The completed synthesis is highlighted by the use of a (cyclo)asparagine-containing dipeptide as a turn inducing fragment. Due to inconsistencies in analytical data between natural
环肉酰胺具有独特的 β 2 αβ 2 α 14 元四肽核心。最初报道的
生物数据和有趣的结构没有完全的立体
化学鉴定,因此需要合成标称(全S )环肉酰胺A和11 R异构体。通过使用含(环)天冬酰胺的二肽作为转角诱导片段来强调完成的合成。由于天然样品和合成样品之间的分析数据不一致,因此有必要重新评估
天然产物的立体
化学。