Enolizable Carbonyls and <i>N</i>
,<i>O</i>
-Acetals: A Rational Approach for Room-Temperature Lewis Superacid-Catalyzed Direct α-Amidoalkylation of Ketones and Aldehydes
作者:Bahria Touati、Abderrahman El Bouakher、Catherine Taillier、Raja Ben Othman、Malika Trabelsi-Ayadi、Sylvain Antoniotti、Elisabet Duñach、Vincent Dalla
DOI:10.1002/chem.201504772
日期:2016.4.18
carbonyl donors, that is, ketones and aldehydes with unbiased N,O‐acetals, is described. Sn(NTf2)4 is an optimal catalyst to promote this challenging transformation at low loading and the reaction shows promising scope. A comprehensive and rational evaluation of this reaction has led to the establishment of an empirical scale of nucleophilic reactivity for a broad set of ketones that should be helpful
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
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.