Tetrahydrofuran → N4-[3-chloro-4-(3-fluorobenzyloxy)-phenyl]-N6-(3a,4,6,6a-tetrahydrofuro[3,4-d]oxazol-2-yl)-quinazoline-4,6-diamine

Participants

Reaction Steps

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).

Provenance & Evidence