Diastereoselective Synthesis of Cycloheptannelated Indoles via Lewis-Acid-Catalyzed (4 + 3)-Cyclization of Donor-Acceptor Cyclopropanes.
Bao Qiong LiZong-Wang QiuAi-Jun MaJin-Bao PengNa FengJi-Yuan DuHan-Peng PanXiang-Zhi ZhangXue-Tao XuPublished in: Organic letters (2020)
An efficient and straightforward Lewis-acid-mediated stereoselective (4 + 3)-cyclization of indole-substituted alkylidene malonates and donor-acceptor cyclopropanes has been developed involving the Friedel-Crafts/Michael addition cyclization cascade. This reaction provides a mild and effective method for the construction of synthetically and structurally interesting functionalized cycloheptannelated indoles.