4-chloro-N-methylpiperidine → 2-Fluoro-9-(1-methylpiperidin-4-yl)-9H-thioxanthen-9-ol

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Reaction Steps

Similarly, 2-fluoro-9-thioxanthone (5.0 g.) is reacted with the Grignard reagent derived from 1.06 g. of magnesium turnings and 5.85 g. of 4-chloro-N-methylpiperidine in tetrahydrofuran as described above to give the corresponding 2-fluoro-9-(1-methyl-4-piperidyl)-thioxanthene-9-ol, m.p. 189°-190° C. The latter is dehydrated by the same procedure to obtain 4-(2-fluoro-9-thioxanthenylidene)-1-methylpiperidine as the maleate salt, m.p. 175°-179° C.

Provenance & Evidence