Ammonia → 4-Chloro-5-(4-methoxyphenyl)-6-phenylfuro[2,3-d]pyrimidine

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Reaction Steps

Suspend 135 g (424 mmol) 5-(4-methoxyphenyl)-6-phenylfuro[2,3-d]pyrimidin-4(3H)-one at RT in 675 ml (7241 mmol) phosphoryl chloride and heat the mixture to boiling (evolution of HCl). After 1 h, cool the dark solution to RT and add dropwise to a vigorously stirred mixture of 2.25 liter water and 4.05 liter conc. ammonia solution (25 wt. %) (heating to 55-75° C., pH>9). At the end of addition, cool to RT and extract the mixture three times with 1.0 liter dichloromethane each time. Combine the organic phases, dry, and concentrate by vacuum evaporation. Stir the residue with diethyl ether, filter with suction and dry at high vacuum. 134.4 g (94.1% of theor.) of the title compound is obtained.

Provenance & Evidence