Regio- and stereoselective base-catalyzed assembly of 6-methylene-5-oxaspiro[2.4]heptanones from alkynyl cyclopropyl ketones
作者:Sofia O. Samultceva、Marina Yu. Dvorko、Dmitrii A. Shabalin、Igor’ A. Ushakov、Alexander V. Vashchenko、Elena Yu. Schmidt、Boris A. Trofimov
DOI:10.1039/d2ob00854h
日期:——
4]heptanones have been synthesized via base-catalyzed dimerization of available alkynyl cyclopropyl ketones. The reaction proceeds effectively in the presence of the t-BuOK/t-BuOH/THF catalytic system at room temperature to afford the desired spirocycles in a regio- and stereoselective manner. A wider synthetic utility of alkynyl cyclopropyl ketones as novel building blocks was demonstrated by the synthesis
6-亚甲基-5-氧杂螺[2.4]庚酮是通过可用的炔基环丙基酮的碱催化二聚反应合成的。该反应在t -BuOK/ t -BuOH/THF 催化体系的存在下在室温下有效进行,以区域和立体选择性的方式提供所需的螺环。多种螺环丙烷的合成证明了炔基环丙基酮作为新型结构单元的更广泛合成用途。