The invention herein is directed to a process for producing a lactam of the formula ##STR1## from a methionine analog of the formula ##STR2## by treating the methionine analog with trimethylsulfonium halide or trimethylsulfoxonium halide in the presence of a base in a suitable aprotic solvent. The invention herein is further directed to the preparation of amidinophenyl pyrrolidinyl .beta.-alanine urea analogs using such methionine and lactam compounds as intermediates, which .beta.-alanine urea analogs are useful as antithrombotics.
本发明涉及一种通过在合适的无极性溶剂中,在碱的存在下,用三甲基
硫鎓卤化物或三甲基亚砜卤化物处理甲
硫氨酸类似物(式子如下)来制备公式为(下图)的内酰胺的方法。本发明还涉及使用这样的甲
硫氨酸和内酰胺化合物作为中间体制备酰胺基苯基
吡咯烷基
β-丙氨酸脲类似物,这些
β-丙氨酸脲类似物可用作抗血栓剂。