A simple primary-secondary diamine organocatalyst catalyzes the cascade Michael–aldol–dehydration of chalcones and unmodified ketones to produce substituted cyclohex-2-enones under mild conditions with good yields and high enantio- and/or diastereoselectivities. The success of the catalyst system is possibly due to simultaneous activation of the electrophilic chalcone by iminium formation and the nucleophilic
一种简单的伯仲二胺有机催化剂催化
查耳酮和未改性酮的级联迈克尔-羟醛脱
水,在温和条件下以良好的收率和高对映选择性和/或非对映选择性生产取代的环己-2-烯酮。催化剂体系的成功可能是由于通过
亚胺形成同时激活亲电子
查耳酮和通过烯胺形成同时活化亲核酮,具有整体分子内
亚胺-二烯胺机制。