作者:Andreas Ahlers、Teresa de Haro、Barbara Gabor、Alois Fürstner
DOI:10.1002/anie.201510026
日期:2016.1.22
An efficient entry into the phosphorylated marine macrolide enigmazole A is described. Enigmazole A interferes with c‐Kit signaling by an as yet unknown mode of action and is therefore a potential lead in the quest for novel anticancer agents. Key to success is a gold‐catalyzed cascade comprising a [3,3]‐sigmatropic rearrangement of a propargyl acetate along the periphery of a macrocyclic scaffold
描述了有效地进入磷酸化的海洋大环内酯恩格唑A。恩尼唑A通过未知的作用方式干扰c-Kit信号传导,因此可能是寻求新型抗癌剂的潜在原因。成功的关键是金催化的级联反应,该反应包括沿大环支架的周边进行乙酸炔丙基酯的[3,3]-σ重排,然后对所得的瞬态乙酸烯丙酯进行环戊烷加氢烷氧基化。该转变要求使用手性金催化剂以确保匹配的双不对称设置。其他值得注意的步骤是通过钯催化的CH活化来制备恶唑结构单元,以及带有炔丙基离去基团的二炔底物的光滑闭环炔烃复分解,这只有很少的先例。