Acid-Modulated Construction of Cyclopenta[<i>b</i>]indole and Cyclohepta[<i>b</i>]indole via Unprecedented C3/C2 Carbocation Rearrangement
作者:Shao-Cong Zhan、Jing Sun、Qiu Sun、Ying Han、Chao-Guo Yan
DOI:10.1021/acs.joc.2c03094
日期:2023.5.5
p-TsOH-catalyzed cycloaddition of various 3-vinylindoles and (indol-2-yl)diphenylmethanols in acetonitrile gave the functionalized cyclopenta[b]indoles in good yields and with high diastereoselectivity via [3 + 2] cycloaddition reaction. More importantly, FeCl3-catalyzed annulation reaction afforded unexpected functionalized cyclohepta[1,2-b:4,5-b′]diindoles in satisfactory yields, in which a formal [4 + 3] cycloaddition
p -TsOH 催化的各种 3-乙烯基吲哚和 (indol-2-yl) 二苯基甲醇在乙腈中的环加成反应以良好的产率和高非对映选择性通过 [3 + 2] 环加成反应得到官能化的环戊[ b ] 吲哚。更重要的是,FeCl 3催化的环化反应以令人满意的产率提供了意想不到的功能化环庚[1,2- b :4,5- b ']二吲哚,其中正式的 [4 + 3] 环加成和前所未有的 C3/C2 碳阳离子重排首先通过单晶结构的测定来证实。