prov:value
| - of the compound of formula (III), prepared in situ with a chlorinating agent, for example thionyl chloride, in an inert solvent, for example tetrahydrofuran, and in the presence of a base, for example triethylamine, at about room temperature, to obtain benzyl 4-[(1,2,3,4-tetrahydro-9H-pyrido[3,4-b]indol-2-yl)-carbonyl]-1-piperidinecarboxylate of formula (V).
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