C[O:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[O:13]C)[N:9]=[CH:8][N:7]=[C:6]2[NH:15][C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Cl:22])[CH:17]=1.C([S-])C.[Na+]>>[OH:2][C:3]1[CH:4]=[C:5]2[C:10](=[CH:11][C:12]=1[OH:13])[N:9]=[CH:8][N:7]=[C:6]2[NH:15][C:16]1[CH:21]=[CH:20][CH:19]=[C:18]([Cl:22])[CH:17]=1Using an analogous procedure to that described in Example 4, 6,7-dimethoxy-4-(3'-chloroanilino)quinazoline was reacted with sodium ethanethiolate to give 6,7-dihydroxy-4-(3'-chloroanilino)quinazoline in 68% yield, m.p. 233°-235° C.
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