Pd(OAc)2-Catalyzed Asymmetric Hydrogenation of α-Iminoesters
摘要:
An efficient Pd(OAc)(2)-catalyzed asymmetric hydrogenation of alpha-iminoesters was realized for the first time at 1 atm hydrogen pressure and room temperature. Pd(OAc)(2), a less expensive Pd salt with low toxicity, was found to be the most suitable catalyst precursor rather than Pd(TFA)(2) which is usually the catalyst of choice for homogeneous asymmetric hydrogenation. The chiral alpha-arylglycine fragments are widely found in many chiral products and bioactive molecules.
Palladium-Catalyzed Enantioselective Three-Component Synthesis of α-Arylglycines
作者:Tamara Beisel、Andreas M. Diehl、Georg Manolikakes
DOI:10.1021/acs.orglett.6b02045
日期:2016.8.19
A general Pd-catalyzed, enantioselectivethree-componentsynthesis of α-arylglycines starting from sulfonamides, glyoxylic acid derivatives, and boronic acids was developed. This operationally straightforward procedure enables the preparation of a wide variety of α-arylglycines in high yields and excellent levels of enantioselectivity from a simple set of readily available starting materials. Incorporation