Water → 2-Isothiocyanato-3-phenylpyridine

Participants

Reaction Steps

6 G. of 2-amino-3-phenylpyridine and 7.4 g. of calcium carbonate in 500 ml. of water is added to a solution of 2.9 ml. thiophosgene in 105 ml. of ether. The reaction mixture is stirred at room temperature for 3 hours and the ether layer is separated. The water layer is extracted with ether and the combined ether extracts dried and evaporated to dryness affording 3-phenyl-2-pyridylisothiocyanate. The residue from the evaporation is allowed to stand at room temperature for 3 days. The reaction mixture is then triturated with ether and filtered affording 9-phenyl-3-(3-phenyl-2-pyridyl) pyrido (1,2-a) 1,3,5-triazine-2,4-dithione m.p. 90°-92° C.

Provenance & Evidence