转鼓
催化作用
铜
羟胺
化学
组合化学
联轴节(管道)
有机化学
材料科学
冶金
亲核细胞
作者
Gary Mathieu,Emna Azek,Calvine Lai,H. Lebel
标识
DOI:10.1021/acscatal.3c06020
摘要
Hydroxylamine derivatives are well-established nitrogen precursors that undergo various transition metal-catalyzed transformations via the cleavage of the nitrogen–oxygen bond. Conversely, the development of a reagent containing a transferable electrophilic hydroxylamine has been elusive due to the inherent fragility of the N–O bond. Herein, we demonstrate the utility of hypervalent iodine chemistry to synthesize a reagent for the transfer of an electrophilic N–O moiety. Reagent 2 is a hydroxylamine umpolung that allows the formation of highly valuable N-arylhydroxylamine synthons via a copper-catalyzed cross-coupling reaction with boronic acids. The process with reagent 2 showed a wide functional group tolerance, especially with other electrophilic functional groups, and exhibited an orthogonal reactivity compared to other methods for synthesizing N-arylhydroxylamine derivatives. These can be subjected to Cope rearrangement and postfunctionalization, affording a variety of nitrogen-containing building blocks. Experimental and in silico mechanistic studies propose a catalytic cycle that involves the formation of a copper(II)-hydroxylamine species as the initial step. This species then reacts with boronic acid to produce the desired product.
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