Synthesis of spirocyclic tetrahydroisoquinolines (spiroTHIQs) via the Castagnoli-Cushman reaction
作者:Alexander Safrygin、Dmitry Dar'in、Olga Bakulina、Mikhail Krasavin
DOI:10.1016/j.tetlet.2020.152408
日期:2020.10
A new route to privileged spirocyclic tetrahydroisoquinolines (spiroTHIQs) has been developed. The key step in which the spirocyclic system is formed in generally good yields and diastereoselectivity is the three-component Castagnoli-Cushman reaction of homophthalic anhydride, cyclic ketones and ammonium acetate. Decarboxylation of the initial adduct yields THIQ lactams which are reduced by lithium
已经开发了一条新的特权螺环四氢异喹啉(spiroTHIQs)的途径。通常以良好的收率和非对映选择性形成螺环体系的关键步骤是高邻苯二甲酸酐,环酮和乙酸铵的三组分Castagnoli-Cushman反应。初始加合物的脱羧产生THIQ内酰胺,其被氢化铝锂还原。与先前报道的类似螺环构建基团的合成方法相比,该路线更短,更收敛且操作更简单。