A metal-free cross-dehydrogenative coupling of N-carbamoyl tetrahydroisoquinoline with a variety of C-H nucleophiles mediated by Na2S2O8 is developed. The reaction proceeds smoothly to give the coupled product in up to 83% yields. The nucleophile scope is broad, including simple ketones, aldehydes, and aryl rings. The carbamoyl protecting group can be readily removed under mild condition. The use of Na2S2O8 as the sole reagent for the CDC reaction is attractive based on economical and environmental factors. (C) 2014 Elsevier Ltd. All rights reserved.
Mechanochemical Oxidative Mannich Reaction: Evaluation of Chemical and Mechanical Parameters for the Mild and Chemoselective Coupling of<i>N</i>-<i>tert</i>-butoxycarbonyltetrahydroquinolines and Ketones
作者:Jing-Bo Yu、Gang Peng、Zhi-Jiang Jiang、Zi-Kun Hong、Wei-Ke Su
DOI:10.1002/ejoc.201600987
日期:2016.11
A mechanochemical oxidative Mannich reaction of N-tert-butoxycarbonyl (Boc) tetrahydroquinolines and ketones was successfully developed under solvent-free ball-milling conditions. The reaction afforded the desired coupling products in satisfactory yields under mild and tractable oxidative conditions. Side reactions such as deprotection of the Boc group were prevented by carefully adjusting the milling