Two alternative synthetic approaches to a variety of enantioenriched 6-arylated piperidin-2-ones have been developed. The first one is based on the hydrogenation of suitably arylated chiral cyclic enehydrazides. The second approach relies on the asymmetric catalytic hydrogenation of the corresponding N-alkylated precursors. (C) 2012 Elsevier Ltd. All rights reserved.
Conversion of γ- and δ-Keto Esters into Optically Active Lactams. Transaminases in Cascade Processes
作者:Ángela Mourelle-Insua、Luiz Arthur Zampieri、Iván Lavandera、Vicente Gotor-Fernández
DOI:10.1002/adsc.201701304
日期:2018.2.15
biotransamination of ethyl or methyl keto esters bearing different alkyl or aryl substitution patterns at α‐position to the ketone functionality. In this manner, the keto esters were transformed into the corresponding amino esters with excellent conversions, which underwent spontaneous cyclisation in the reaction medium without addition of external reagents. Depending on the transaminase selectivity, both lactam