Phosphorus oxychloride → N-(5-Chlorobenzo[d][1,3]dioxol-4-yl)-5,7-difluoroquinazolin-4-amine

Participants

Reaction Conditions

Reaction Steps

Phosphoryl chloride (4.96 ml) was added over a period of 40 minutes to a stirred mixture of 5,7-difluoro-3,4-dihydroquinazolin-4-one (6.5 g), chlorobenzene (64.9 ml), 6-chloro-2,3-methylenedioxyaniline (7.08 g) and diisopropylethylamine (7.47 ml) that had been heated to 95° C. under an atmosphere of nitrogen gas. The resultant reaction mixture was heated at 95° C. for 5 hours. The reaction mixture was cooled to 18° C. and stirred for 30 minutes. Stirring was stopped and the reaction mixture was allowed to stand for 30 minutes. The mixture was filtered and the isolated solid was washed with chlorobenzene (2×23 ml) and dried in vacuo at 45° C. There was thus obtained 4-(6-chloro-2,3-methylenedioxyanilino)-5,7-difluoroquinazoline as a mono-hydrochloride salt (8.9 g, 96.5% HPLC purity using Method A, retention time 4.46 minutes); m.p. 234-237° C.; NMR Spectrum: (DMSOd6) 5.5-6.0 (br s, 1H), 6.15 (s, 2H), 7.0 (d, 1H), 7.1 (d, 1H), 7.6 (d, 1H), 7.8 (m, 1H), 8.7 (s, 1H).

Provenance & Evidence