反应详情

N4-[3-Chloro-4-(3-fluorobenzyloxy)-phenyl]-N6-(3a,4,6,6a-tetrahydrofuro[3,4-d]oxazol-2-yl)-quinazoline-4,6-diamine is prepared by adding thioCDI (27 mg, 0.152 mmol) to a stirred solution of N4-[3-chloro-4-(3-fluoro-benzyloxy)-phenyl]-quinazoline-4,6-diamine (60 mg, 0.152 mmol) in 1:1 THF:DCM (8 mL). After 3 hours, 2-amino-cyclopentanol (30 mg, 0.30 mmol) is added and the reaction mixture stirred for 4 hours. Solvent is removed under reduced pressure and the resulting thiourea is triturated with diethyl ether. The crude thiourea is suspended in THF (10 mL) and 1 M NaOH in water (0.38 mL) is added followed by addition of a 1 M TsCl solution in THF (0.17 mL). After 1 hour, the reaction mixture is diluted with EtOAc and water, and the phases separated. The aqueous phase is extracted with EtOAc and the combined organic extracts are dried (Na2SO4) and concentrated. Purification by column chromatography (10:5:1 EtOAc:Hexanes:MeOH) provides the desired product (50 mg, 65%). MS APCI (+) m/z 506, 508 (M+1, Cl pattern) detected; 1H NMR (400 mHz, CD3CN) δ 8.49 (s, 1H), 8.23 (bs, 1H), 7.94 (s, 1H), 7.73 (m, 2H), 7.59 (m, 2H), 7.45 (m, 1H), 7.35 (d, 1H), 7.29 (d, 1H), 7.19-7.10 (m, 3H), 5.23 (s, 2H), 5.18 (m, 1H), 4.66 (m, 1H), 4.11 (d, 1H), 3.96 (d, 1H), 3.56 (dd, 2H).

1. customN4-[3-Chloro-4-(3-fluorobenzyloxy)-phenyl]-N6-(3a,4,6,6a-tetrahydrofuro[3,4-d]oxazol-2-yl)-quinazoline-4,6-diamine is prepared
2. customSolvent is removed under reduced pressure
3. customthe resulting thiourea is triturated with diethyl ether
4. addition1 M NaOH in water (0.38 mL) is added
5. additionfollowed by addition of a 1 M TsCl solution in THF (0.17 mL)
6. waitAfter 1 hour
7. additionthe reaction mixture is diluted with EtOAc and water
8. customthe phases separated
9. extractionThe aqueous phase is extracted with EtOAc
10. dry with materialthe combined organic extracts are dried (Na2SO4)
11. concentrationconcentrated
12. customPurification by column chromatography (10:5:1 EtOAc:Hexanes:MeOH)