Process for the preparation of analogous amidino-phenyl-pyrrolidin-beta-alanine urea.

The invention relates to a FOR A lactam of formula (2) PROCESS FROM A analogue of methionine of formula (1) by treating the analogue of methionine halide TRIMETILSULFONICO or halide TRIMETILSULFOXONICO IN THE PRESENCE OF A BASE IN A PROPER aprotic solvent. The invention is directed to the preparation of amidinophenyl pyrrolidine analogs {BE} - alanine UREA COMPOUNDS USING THOSE methionine and lactam as intermediaries, with the analogs {BE} - alanine UREA useful as antithrombotics.