Confirmation of the Revised Structure of Samoquasine A and a Proposed Structural Revision of Cherimoline
作者:Francis Dhoro、Jesse Parkin-Gibbs、Matthew McIldowie、Brian W. Skelton、Matthew J. Piggott
DOI:10.1021/acs.jnatprod.8b00319
日期:2018.7.27
product samoquasine A has remained obscure since its isolation from custard apple seeds in 2000. One of the proposed structures, benzo[f]phthalazin-4(3H)-one, was prepared in two steps by regioselective ortho-lithiation/formylation of N,N-diisopropyl-2-naphthylamide, followed by cyclization with hydrazine, but was shown to be different from the natural product. Perlolidine, another candidate structure
自2000年将其从蛋奶苹果种子中分离出来以来,天然产物samoquasine A的身份一直不为人所知。拟议的结构之一,苯并[ f ]酞嗪-4(3 H)-一,是通过区域选择性邻位-二步制备的。N,N-二异丙基-2-萘酰胺的锂化/甲酰化,然后用肼环化,但是显示出与天然产物不同。通过涉及丁基乙烯基醚的β-选择性Heck反应的新途径,合成了另外的候选化合物Perlolidine。三甲基甲硅烷基重氮甲烷将哌洛啶和Samoquasine A均转化为相同的N-甲基衍生物。此外,这13Perlolidine和另一种结构错误分配的天然产物cherimoline的1 C NMR谱几乎相同。因此,萨莫瓜碱A和盐酸苯丙氨酸实际上是过洛立定。