Phenyl isocyanate → HCID 10555594, compound

Participants

Reaction Steps

A mixture of the compound obtained in Example 5A (1.0 g), phenyl isocyanate (0.27 g) and tetrahydrofuran (20 ml) was stirred at room temperature for 3 hours, after which it was concentrated under reduced pressure. The residue was subjected to silica gel column chromatography and eluted with ethyl acetate-hexane-methanol (20:20:1, v/v) to yield ethyl 2-(N,N-diethylaminomethyl)-4-(3,4-dimethoxyphenyl)-7-phenylcarbamoyl-5,6,7,8-tetrahydrothieno[2,3-b:5,4-c']dipyridine-3-carboxylate (for structural formula, see below) (1.10 g, 88%), which was then recrystallized from ethyl acetate-hexane to yield colorless prismatic crystals having a melting point of 154 to 155° C. ##STR52##

Provenance & Evidence