Regioselective/electro-oxidative intermolecular [3 + 2] annulation for the preparation of indolines
作者:Qingqing Wang、Pan Wang、Xinlong Gao、Dan Wang、Shengchun Wang、Xingan Liang、Liwei Wang、Heng Zhang、Aiwen Lei
DOI:10.1039/c9sc05729c
日期:——
amines or vinyl anilines for the preparation of pyrrolidines or indolines, the intermolecular version is less studied. Herein, this electrochemical intermolecular oxidative annulation of anilines and alkenes for the preparation of indolines proceeded under external oxidant-free conditions. The most noteworthy achievement of our work is the facile generation of indolines with quaternary centers at the
[3 + 2] Coupling of Quinone Monoacetals by Combined Acid–Hydrogen Bond Donor
作者:Toshifumi Dohi、Yinjun Hu、Tohru Kamitanaka、Naohiko Washimi、Yasuyuki Kita
DOI:10.1021/ol201886r
日期:2011.9.16
expeditious and efficient [3 + 2] coupling approach of quinonemonoacetals 1 with alkene nucleophiles 2 by the action of an activated Brønsted acid in the presence of a hydrogen bond donor perfluorinated alcohol has been achieved. With the optimized combined acid, the reaction could proceed under mild conditions by only mixing the two reactants to afford the cycloadducts 3 in a short time (within 10
Controlled couplings of quinone monoacetals using reusable polystyrene-anchored specific proton catalyst
作者:Toshifumi Dohi、Yinjun Hu、Tohru Kamitanaka、Yasuyuki Kita
DOI:10.1016/j.tet.2012.07.089
日期:2012.10
Controlled couplings of quinone monoacetals 1 with soft nucelophiles have been achieved using a new and reusable perfluorobenzoic acid (PFBA) immobilized on polystyrene beads as an efficient polymer-anchored specific proton. Various advantages regarding the recovery, reusability, and reproducibility as well as the high chemoselectivity toward quinone monoacetals 1 have been determined as the key features of the cleaner systems with newly developed solid acid promoter for the reactions. (C) 2012 Elsevier Ltd. All rights reserved.