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.

由苯甲酰和乙酸铵制备的（±）-1,2-双(2-甲基苯基)乙二胺，经光学拆分后形成手性框架，用于连接4,5-位置的2-(1-苄基-2-羟乙基)亚胺-1,3-二甲基咪唑烷，并带有2-甲基苯基。对1,3-二甲基-4,5-双(2-甲基苯基)咪唑烷及其相关1,3-二苄基-4,5-二苯基咪唑烷的催化活性进行了研究，考察了其在不对称迈克尔加成反应中对叔丁基二苯基亚胺乙酸酯与丙烯酸乙酯的催化作用。