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
Palladium-Catalyzed C-2 C–H Heteroarylation of Chiral Oxazolines: Diverse Synthesis of Chiral Oxazoline Ligands
作者:Tuo Xi、Yuncai Mei、Zhan Lu
DOI:10.1021/acs.orglett.5b03041
日期:2015.12.18
A direct, efficient, and practical protocol to install a chiral Oxazoline unit onto aryl/heteroaryl rings via palladium-catalyzed C-H functionalization of 2-positions of oXazolines with a variety of halides using dppe as the ligand has been developed. Various chiral oxazdline ligands could be synthesized, even in a 10-g scale process. This protocol is a good supplement to traditional methods and for diverse synthesis of chiral oxazoline ligands.