1,4-Addition of (Diphenylmethylene)amine to Acceptor Substituted Olefins. A Versatile Synthesis of Protected β-Amino Acids, Nitriles, and Ketones
作者:Ludger Wessjohann、Gregory Mcgaffin、Armin de Meijere
DOI:10.1055/s-1989-27252
日期:——
(Diphenylmethylene)amine [benzophenone imine, DPMA-H] cleanly reacts with a variety of α,β-unsaturated esters, nitriles, ketones, and aldehydes 1a-q to give Michael type adducts 2a-q, generally, in respectable to excellent yields. Sterically congested and donor-substituted Michael acceptors do not react. The β-amino-substituted products can be further transformed in their protected form, or selectively deprotected under mild conditions, e.g. by catalytic hydrogenation.
(二苯基亚甲基)胺[二苯甲酮亚胺,DPMA-H]能与多种δ、δ-不饱和酯、腈、酮和醛 1a-q 顺利反应,生成迈克尔型加合物 2a-q,收率一般可观,甚至极佳。立体拥塞和供体取代的迈克尔受体不会发生反应。δ-氨基取代的产物可以被保护的形式进一步转化,或在温和的条件下选择性地脱保护,例如通过催化氢化。