Palladium-Catalyzed Cyclopropanation of Strained Alkenes with 3-Pinacolatoboryl-1-arylallyl Carboxylates
作者:Yoshikazu Horino、Yu Takahashi、Ryota Kobayashi、Hitoshi Abe
DOI:10.1002/ejoc.201403284
日期:2014.12
The palladium-catalyzed cyclopropanation of strained alkenes with 3-pinacolatoboryl-1-arylallyl carboxylates was explored. The reactions proceeded smoothly under mild conditions, and the cyclopropanation products were obtained in good to high yields with high diastereoselectivities if CsF, 18-crown-6, and molecular sieves were used as additives. The reaction was hypothesized to proceed through the
探索了钯催化的应变烯烃与 3-频哪醇硼基-1-芳基烯丙基羧酸盐的环丙烷化反应。反应在温和的条件下顺利进行,如果使用CsF、18-Crown-6和分子筛作为添加剂,环丙烷化产物的收率高,非对映选择性高。假设该反应通过形成推定的钯环丁烯中间体进行,需要考虑该中间体来解释观察到的立体化学。