[OH-].[Na+].O.[NH2:4][CH:5]1[CH2:9][CH2:8][N:7]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[CH2:6]1.C(Cl)(=O)OCC.[C:21](=S)=[S:22]>>[N:4]([CH:5]1[CH2:9][CH2:8][N:7]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[CH2:6]1)=[C:21]=[S:22](a-4) A mixture of 8.6 parts of sodium hydroxide and 120 parts of water was stirred at a temperature below 10° C. and there were added successively 17 parts of carbon disulfide and 35 parts of ethyl 3-amino-1-pyrrolidinecarboxylate. Stirring was continued for 3 hours. Then there were added dropwise 23.5 parts of ethyl carbonochloridate. Upon completion, stirring was continued for 2 hours at 60° C. The reaction mixture was extracted with methylbenzene. The extract was dried, filtered and evaporated, yielding 55 parts (100%) of ethyl 3-isothiocyanato-1-pyrrolidinecarboxylate as a residue (interm. 6).
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