A method for the preparation of indolines via palladium-catalyzed aerobic intramolecular allylic CH activation was developed. Oxygen was successfully used as oxidant with catalytic amount of 1,4-benzoquinone. 16 examples were reported, the majority of substrates gave moderate to good yields.
Pd-catalyzed asymmetric aza-Wacker-type cyclization reaction of olefinic tosylamides
作者:Feng Jiang、Zhengxing Wu、Wanbin Zhang
DOI:10.1016/j.tetlet.2010.07.084
日期:2010.9
The Pd-catalyzed asymmetric aza-Wacker-type cyclization reaction of the olefinic tosylamides with molecular oxygen as the green oxidant was developed. Under the optimized conditions, excellent catalytic activity and good enantioselectivity with up to 74% ee were obtained with quinolineoxazoline ligands. This reaction provides direct and easy access to chiral nitrogen-containing heterocycles which retain
Pd(II)-catalyzed oxidative cyclization reaction for the preparation of 2-substituted 1,2,3,4-tetrahydroquinolines with halide functionality
作者:Feng Jiang、Zhengxing Wu、Wanbin Zhang
DOI:10.1016/j.tet.2010.12.017
日期:2011.2
The first Pd(II)-catalyzed oxidative cyclization reaction was developed for preparation of 2-substituted 1,2,3,4-tetrahydroquinolines from olefinic tosylamides. Under the optimized conditions, up to 86% yield was obtained. This reaction provides direct and easy access to 2-substituted 1,2,3,4-tetrahydroquinolines with halide functionality. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis of Oxo-Bridged Dibenzoazocines through Ruthenium-Catalyzed [4 + 3]-Cycloannulation of Aza-<i>ortho</i>-quinone Methides with Carbonyl Ylides