The reaction of phenyl isothiocyanate (I) with 2-imino-1-methyl pyrrolidine (II) in benzene gives N-(1-methyl-2-pyrrolidinylidene)-N'-phenylthiourea (III), which is treated with iodomethane in refluxing acetone to afford methyl N-1-methyl-2-pyrrolidinylidene)-N'-phenylcarbamidothioate (IV). Finally, this compound is treated with morpholine in refluxing isopropanol.