A convergent enantioselective total synthesis of (−)-perhydrohistrionicotoxin with an intramolecular imino ene-type reaction as a key step
作者:David Tanner、Lars Hagberg
DOI:10.1016/s0040-4020(98)00425-6
日期:1998.7
intramolecular imine ene-type reaction was used for the key spirocyclisation step (14 to 3, with 3 being obtained as a single diastereoisomer). Spirocyclisation precursor 14 was prepared from enantiomerically pure ketone 13, itself available via an efficient one-pot, three-component, coupling reaction involving chiral electrophiles 9 and 10. The stereogenic centres of 9 and 10 derive in turn from Sharpless
描述了神经毒性螺环生物碱(-)-过氢组织神经毒素(2)的会聚对映选择性全合成。Lewis酸介导的分子内亚胺烯型反应用于关键的螺环化步骤(14至3,其中3为单一非对映异构体)。螺环化前体14由对映体纯的酮13制备,其本身可通过涉及手性亲电子试剂9和10的有效的一锅三组分偶联反应获得。9和10的立体成因中心反过来又从Sharpless动力学拆分中衍生而来,后者允许从常见的外消旋前体8中获得两种手性亲电试剂。