Diastereoselective Synthesis of Tetrahydrospiro[carbazole-1,3′-indolines] via an InBr<sub>3</sub>-Catalyzed Domino Diels–Alder Reaction
作者:Daqian Wang、Jing Sun、Ru-Zhang Liu、Yang Wang、Chao-Guo Yan
DOI:10.1021/acs.joc.1c00103
日期:2021.4.16
reported TfOH-catalyzed one-pot reaction of indoles, acetophenones, and 3-methyleneoxindolines. Additionally, the InBr3-catalyzed reaction of the initially prepared 1,1′-bis(indolyl)phenylethanes with 3-phenacylideneoxindolines also gave the corresponding tetrahydrospiro[carbazole-1,3′-indolines] in good yields and with excellent diastereoselectivity. The reaction mechanism involved the sequential in
描述了简单的InBr 3催化的吲哚,苯乙炔和各种3-亚甲基二氢吲哚在甲苯中的多米诺反应。该反应不仅为多取代的四氢螺环[咔唑-1,3'-二氢吲哚]提供了方便的合成方法,而且使四氢螺环[咔唑-1,3'-二氢吲哚]的非对映异构体与先前报道的完全不同。 TfOH催化的吲哚,苯乙酮和3-亚甲基恶二啉的一锅反应。此外,InBr 3最初制备的1,1'-双(吲哚基)苯基乙烷与3-苯乙叉基二氧杂吲哚的催化反应也得到了相应的四氢螺[咔唑-1,3'-二氢吲哚],收率高,非对映选择性高。反应机理包括反应性双亲3-烯基吲哚的顺序原位生成,Diels-Alder反应和路易斯酸控制的非对映异构化过程。