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To a stirred and cooled mixture of 4 parts of sodium hydroxide in 60 parts of water were added successively 7.9 parts of carbon disulfide and 17.2 parts of ethyl 4-amino-1-piperidinecarboxylate at a temperature below 10° C. Stirring was continued for 30 minutes at this temperature. Then there were added dropwise 10.9 parts of ethyl carbonochloridate (exothermic reaction: temp. rises to about 35° C.). Upon completion, stirring was continued for 2 hours at 60° C. The reaction mixture was cooled and the product was extracted with methylbenzene. The extract was dried, filtered and evaporated, yielding 22 parts (100%) of ethyl 4-isothiocyanato-1-piperidinecarboxylate as a residue (intermediate 26).

1. temperaturecooled
2. stirringStirring
3. stirringUpon completion, stirring
4. waitwas continued for 2 hours at 60° C
5. temperatureThe reaction mixture was cooled
6. extractionthe product was extracted with methylbenzene
7. customThe extract was dried
8. filtrationfiltered
9. customevaporated