Intramolecular Reactions of Benzylic Azides with Ketones: Competition between Schmidt and Mannich Pathways
作者:Aaron Wrobleski、Jeffrey Aubé
DOI:10.1021/jo001367p
日期:2001.2.1
The Lewis acid-promoted reactions of benzylic azides with ketones can proceed by two major pathways. The azido-Schmidt reaction involves simple addition of azide to the ketone followed by rearrangement and ring expansion. In addition, benzylic azides can undergo prior rearrangement to afford iminium ions that can subsequently participate in a Mannich reaction. A series of ketones containing an alpha CH2(CH2)nCH(N3)Ph
As a powerful complement to existing organic amine catalysis, direct activation of the α-C−H bonds of saturated cyclic ketones is realized for the first time in an amine-free and directing-group-free catalytic mode. The carbonyl group binds to a defect site of the quantum dot (QD) surface, selectively weakening the α-C−H bond, instead of the β-C−H bond, and exclusively generating an α-C radical under