Reactions of(4S,5R)-1-(3,4-Dimethyl-2-oxo-5-phenylimidazolidine)carbonyl-isocyanate (4) with appropriate Baylis-Hillman adducts 5 gave the corresponding acyl carbamates 6,7 as equimolar diastereomeric mixtures. These mixtures were treated with DABCO, to afford with moderate diastereoselection easily separable [2-(3",4"-dimethyl-2"-oxo-5"-phenylimidazolidine-1-carboxamido)(aryl)methyl]acrylates 8 and 9.
                                    (4S,5R)-1-(3,
4-二甲基-2-氧代-5-苯基
咪唑烷)羰基
异氰酸酯 (4) 与适当的 Baylis-Hillman 加合物 5 反应,得到相应的酰基
氨基甲酸酯 6、7,为等摩尔非对映异构体混合物。这些混合物经 
DABCO 处理后,可得到易于分离的[2-(3",4"-二甲基-2"-氧代-5"-苯基
咪唑烷-1-甲酰胺基)(芳基)甲基]
丙烯酸酯 8 和 9。