反应详情

温度

115 °C

Ethyl 2-(6-chloro-4-(isopropylamino)pyridin-3-yl)-5-methyloxazole-4-carboxylate (28a) (50 mg, 0.15 mmol) was dissolved in 1,4-Dioxane (5 mL): H2O (1 mL), to it benzo[d]thiazol-6-amine (0.15 mmol), Na2CO3 (0.6 mmol) and xanthphos (0.06 mmol) were added and degassed for 10 min. Pd2(dba)3 (0.06 mmol) was added and degassed once again for 15 min and heated at 115° C., overnight. The reaction mass was filtered through a small pad of celite and concentrated the filtrate to remove solvent. The crude material obtained was purified by column chromatography through silica gel and MeOH: CHCl3 as eluent. The material obtained was further purified by preparative TLC to obtain the title compound, ethyl 2-(6-(benzo[d]thiazol-6-ylamino)-4-(isopropylamino)pyridin-3-yl)-5-methyloxazole-4-carboxylate. 1H NMR: 400 MHz, DMSO-d6: δ 1.28-1.35 (m, 9H), 2.66 (s, 3H), 3.71-3.72 (m, 1H), 4.30 (q, J=7.20 Hz, 2H), 6.16 (s, 1H), 7.59 (dd, J=2.40, 9.00 Hz, 1H), 7.96 (d, J=8.80 Hz, 1H), 8.10 (d, J=7.20 Hz, 1H), 8.53 (s, 1H), 8.66 (d, J=2.00 Hz, 1H), 9.16 (s, 1H), 9.36 (s, 1H). LC/MS: Ascentis Express C18, 5×2.1 mm, 2.7 μm; Solvent A=2% ACN: 98% H2O: 10 mM NH4COOH; Solvent B=98% ACN: 2% H2O: 10 mM NH4COOH; gradient 0-100% B over 1.5 min; retention time: 2.127 min; LCMS (ES-API), m/z 438.2 (M+H). HPLC: Sunfire C18 (150×4.6 mm), 3.5 micron; Solvent A=5% ACN: 95% H2O: 0.05% TFA pH=2.5; Solvent B=95% ACN: 5% H2O: 0.05% TFA pH=2.5; gradient 0-100% B over 15 min (23 min run time); Flow rate: 1.0 μL/min; Retention time: 7.483 min; Purity: 99.7%.

1. customdegassed for 10 min
2. customdegassed once again for 15 min
3. filtrationThe reaction mass was filtered through a small pad of celite
4. concentrationconcentrated the filtrate
5. customto remove solvent
6. customThe crude material obtained
7. customwas purified by column chromatography through silica gel and MeOH
8. customThe material obtained
9. customwas further purified by preparative TLC