反应详情

A suspension of 6-nitro-2-(1,3-benzodioxol-5-yl)-quinazoline (37 g, 0.126 mol) and SnCl2 2H2O (117.2 g, 0.504 mol) in ethanol (500 ml) was heated at reflux for 1 h. After cooling to r.t., the solvent was removed i.v., chloroform was added and the mixture was basified with ammonia. The precipitate was filtered off and washed with chloroform. The filtrates were collected, washed with water and dried over Na2SO4. The solution was concentrated i.v., and the residue triturated with diisopropyl ether/petroleum ether. The solid was filtered and dried i.v. to give the titled product (21.2 g, 64% yield). C15H11N3O2, MW: 265.27. mp 191-192° C.; 1H NMR (DMSO-d6) 9.24 (s, 1H), 8.05 (dd, 1H), 7.91 (d, 1H), 7.73 (d, 1H), 7.39 (dd, 1H), 7.03 (d, 1H), 6.90 (d, 1H), 6.11 (s, 2H), 5.93 (s, 2H); IR (KBr) 3319, 3203, 1631, 1500, 1446; TLC (CHCl3/MeOH 9/1) Rf=0.3.

1. temperaturewas heated
2. temperatureat reflux for 1 h
3. customthe solvent was removed i.v
4. addition, chloroform was added
5. filtrationThe precipitate was filtered off
6. washwashed with chloroform
7. customThe filtrates were collected
8. washwashed with water
9. dry with materialdried over Na2SO4
10. concentrationThe solution was concentrated i.v
11. custom, and the residue triturated with diisopropyl ether/petroleum ether
12. filtrationThe solid was filtered
13. customdried i.v