Thionyl Chloride → 6-Methanesulfonamido-3,4-dihydro-1'-[2-(2-chloro-pyrid-5-yl)ethyl]-spiro[(2H)-1-benzopyran-2,4'-piperidine]-4-one

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The title compound was prepared from 3,4-dihydro-6-methanesulfonamidospiro[(2H)-1-benzopyran-2,4'-piperidine]-4-one hydrochloride and 2-chloro-5-chloroethylpyridine hydrochloride by a procedure analogous to that described in Example 92, Step B. [The 2-chloro-5-chloroethylpyridine hydrochloride used in this reaction was obtained by treating 6-chloropyrid-3-yl acetic acid (L. A. Carlson, Acta Pharm. Suecica, 9, 411 (1972)) with borane-tetrahydrofuran complex followed by reaction with thionyl chloride.] mp 213°-215° C. Anal. Calc'd. for C21H24ClN3O4S: C, 56.05; H, 5.38; N, 9.34. Found: C, 55.93; H, 5.41; N, 9.20.

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