Ammonia → 4-Chloro-7,8-dihydro-[1,4]dioxino[2,3-g]quinazoline

反応式

[CH2:1]1[CH2:14][O:13][C:12]2[CH:11]=[C:10]3[C:5]([C:6](=O)[NH:7][CH:8]=[N:9]3)=[CH:4][C:3]=2[O:2]1.P(Cl)(Cl)([Cl:18])=O.N>>[Cl:18][C:6]1[C:5]2[C:10](=[CH:11][C:12]3[O:13][CH2:14][CH2:1][O:2][C:3]=3[CH:4]=2)[N:9]=[CH:8][N:7]=1

参加物

反応物 3

HCID 222Ammonia

HCID 24813Phosphorus oxychloride

HCID 1357365997,8-dihydro-[1,4]dioxino[2,3-g]quinazolin-4(3H)-one

生成物 1

HCID 189328674-Chloro-7,8-dihydro-[1,4]dioxino[2,3-g]quinazoline

実験手順

A mixture of 25.3 g. of 6,7-ethylenedioxyquinazolin-4(3H)-one and 50 ml. of phosphorus oxychloride is refluxed for 10 minutes, cooled, and added with stirring to one liter of ice. After addition of concentrated ammonia the resulting mixture is extracted with chloroform and the chloroform solution chromatographed through 300 mls. of silica gel while eluting with chloroform. Evaporation of the eluent yields 4-chloro-6,7-ethylenedioxyquinazoline, m.p. 169°-174° C.