Substrate specific ring opening annulations of donor-acceptor cyclopropanes with 3-phenacylidene-2-oxindoles
作者:Sayan Pramanik、Pinaki Saha、Prasanta Ghosh、Chhanda Mukhopadhyay
DOI:10.1016/j.tet.2022.133202
日期:2023.1
A DBU promoted ring opening of donor-acceptor (D-A) cyclopropanes and sequential [3 + 2] annulation reaction with diversified 3-phenacylidene-2-oxindoles were reported. This facile protocol provided an efficient functional group controlled approach towards a variety of spiro [cyclopentane-1,3′-indoline]-2,2-dicarbonitriles (17 examples) and spiro [cyclopent [2]ene-1,3′-indoline]-3-carbonitriles (14
据报道,DBU 促进了供体-受体 (DA) 环丙烷的开环和与多样化 3-phenacylidene-2-oxindole 的连续 [3 + 2] 环化反应。这个简单的协议提供了一种有效的功能组控制方法来处理各种螺 [cyclopentane-1,3'-indoline]-2,2-dicarbonitories(17 个例子)和 spiro [cyclopent [2]ene-1,3'-indoline ]-3-腈(14例)衍生物,产率高。机理研究表明,区域选择性共轭加成具有不同的官能团,可控制反应途径。良好的非对映选择性和广泛的底物范围等优点使该过程极具吸引力。