Electrophile-Controlled Regiodivergent Palladium-Catalyzed Imidoylative Spirocyclization of Cyclic Alkenes
作者:Shumin Ding、Yue Pu、Jiao Lin、Haixia Zhao、Qiang Tang、Jian Wang
DOI:10.1021/acs.orglett.4c00181
日期:2024.3.8
spirocyclization of isocyano cycloalkenes has been developed, offering efficient and selective approaches toward spirocyclic hydropyrrole scaffolds. 2-Azaspiro-1,7-dienes could be obtained through a “chain-walking” process with aryl/vinyl iodides as electrophiles, while the normal Heck product 2-azaspiro-1,6-dienes were selectively generated when aryl triflates were used as the coupling partner of isocyanides
开发了一种分子间可控的钯催化异氰基环烯烃螺环化反应,为螺环氢吡咯支架提供了有效且选择性的方法。 2-氮杂螺-1,7-二烯可以通过芳基/乙烯基碘作为亲电子试剂的“链行走”过程获得,而当使用芳基三氟甲磺酸酯时,可以选择性地生成正常的 Heck 产物 2-氮杂螺-1,6-二烯作为异氰化物的偶联伙伴。机理研究表明 Pd(II) 中间体的抗衡阴离子在区域选择性控制中发挥着至关重要的作用。二氢吡咯稠合的 5,6,7 元螺环在温和条件下可切换,具有广泛的官能团耐受性。