Carbon Disulfide → Ethyl 3-isothiocyanatopyrrolidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

(a-3) To a stirred and cooled (10° C.) mixture of 37 parts of N,N-methane-tetraylbis[cyclohexanamine] and 594 parts of tetrahydrofuran were added 91.2 parts of carbon disulfide. After cooling to -10° C., 27.5 parts of ethyl 3-aminopyrrolidinecarboxylate were added during a period of 5 minutes (exothermic reaction). The reaction mixture was allowed to reach room temperature and evaporated. The residue was purified by column chromatography over silica gel using trichloromethane as eluent. The pure fractions were collected and the eluent was evaporated, yielding 32 parts (99.8%) of ethyl 3-isothiocyanato-1-pyrrolidinecarboxylate as a residue (interm. 6).

Provenance & Evidence