Stereoselective Conjugate Addition Directed by an Enantiomerically Pure Ketal. Preparation of the Cyclohexanone Fragment of <i>N</i>-Methylwelwitindolinone C Isothiocyanate
作者:Joseph P. Konopelski、Hongbo Deng、Kai Schiemann、Joseph M. Keane、Marilyn M. Olmstead
DOI:10.1055/s-1998-1886
日期:1998.10
has been prepared. The synthesis is diastereoselective for the production of the C12 quaternary center, which is obtained via a conjugate addition reaction directed by an adjacent chiral, nonracemic ketal. A single crystal X-ray analysis of a derivative of the final product established the absolute stereochemistry at C12.
已制备用于合成海洋天然产物 N-methylwelwitindolinone C 异硫氰酸酯的环己酮中间体。该合成对 C12 季铵中心的产生具有非对映选择性,其通过由相邻手性非外消旋缩酮引导的共轭加成反应获得。最终产品衍生物的单晶 X 射线分析确定了 C12 处的绝对立体化学。