Optical Resolution of (±)-1,2-Bis(2-methylphenyl)ethylene-1,2-diamine as a Chiral Framework for 2-Iminoimidazolidine with 2-Methylphenyl Pendant and the Guanidine-Catalyzed Asymmetric Michael Reaction of tert-Butyl Diphenyliminoacetate and Ethyl Acrylate

(±)-1,2-Bis(2-methylphenyl)ethylene-1,2-diamine, prepared from benzil and ammonium acetate, was
optically resolved as a chiral framework for 2-(1-benzyl-2-hydroxyethyl)imino-1,3-dimethylimidazolidine
with 2-methylphenyl pendants at the 4,5-positions. Catalysis ability of the 1,3-dimethyl-4,5-bis(2-methylphenyl)imidazolidine and the related 1,3-dibenzyl-4,5-diphenylimidazolidine was examined in the
asymmetric Michael reaction of t-butyl diphenyliminoacetate and ethyl acrylate.

由苯甲酰与乙酸铵制备的（±）-1,2-双(2-甲基苯基)乙烯-1,2-二胺，作为一种手性框架，用于2-(1-苄基-2-羟乙基)亚氨基-1,3-二甲基咪唑啉，其2-甲基苯基取代基位于4,5位。考察了1,3-二甲基-4,5-双(2-甲基苯基)咪唑啉及其相关1,3-二苄基-4,5-二苯基咪唑啉在t-丁基二苯基亚氨基乙酸酯与丙烯酸乙酯的异步迈克尔加成反应中的催化能力。