Enantioselective synthesis of constrained trans-amino benzazepi none utilizing palladium-mediated Jeffery-Heck reaction and rhodium(II) catalyzed asymmetric hydrogenation as key steps are described. Diverse functional groups such as alkyl, aryl, basic or amino acid moieties were introduced with minimal racemization. (c) 2007 Elsevier Ltd. All rights reserved.
Enantioselective synthesis of constrained trans-amino benzazepi none utilizing palladium-mediated Jeffery-Heck reaction and rhodium(II) catalyzed asymmetric hydrogenation as key steps are described. Diverse functional groups such as alkyl, aryl, basic or amino acid moieties were introduced with minimal racemization. (c) 2007 Elsevier Ltd. All rights reserved.
Enantioselective synthesis of constrained phenylalanine analogues
作者:Prasad V. Chaturvedula、Stephen E. Mercer、Leatte Guernon、John E. Macor、Gene M. Dubowchik
DOI:10.1016/j.tetlet.2010.08.057
日期:2010.10
through a tandem palladium-mediated Heck reaction followed by a rhodium(II)-catalyzed asymmetric hydrogenation. Aryl bromides were found to be better substrates in providing products with higher purity and in good yield. The cesium carbonate-mediated cyclization proceeded smoothly in good yield and optical purity. Aryl iodides reacted selectively over bromides under Jeffery-type conditions (Pd(OAc)2, Bu4NCl