Cesium carbonate → Methyl 2-(6-{[(ethylamino)carbonyl]amino}pyridin-3-yl)-1,3-thiazole-5-carboxylate
反応式
[CH2:1]([NH:3][C:4]([NH:6][C:7]1[CH:12]=[CH:11][C:10](B2OC(C)(C)C(C)(C)O2)=[CH:9][N:8]=1)=[O:5])[CH3:2].Br[C:23]1[S:24][C:25]([C:28]([O:30][CH3:31])=[O:29])=[CH:26][N:27]=1.C(=O)([O-])[O-].[Cs+].[Cs+]>>[CH2:1]([NH:3][C:4]([NH:6][C:7]1[N:8]=[CH:9][C:10]([C:23]2[S:24][C:25]([C:28]([O:30][CH3:31])=[O:29])=[CH:26][N:27]=2)=[CH:11][CH:12]=1)=[O:5])[CH3:2]参加物
4
実験手順
N-Ethyl-N′-[5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridin-2-yl]urea (Intermediate 1, 0.20 g, 0.69 mmol), methyl 2-bromo-1,3-thiazole-5-carboxylate (0.152 g, 0.69 mmol), tetrakis triphenyl phosphine palladium (0.08 g, 0.069 mmol), and cesium carbonate (0.245 mg, 0.754 mmol) were taken in a microwave vial and degassed with argon. Then dioxane:water (4:1, 3 mL) was added to it and microwaved at 110° C. for half an hour. The reaction mixture was partitioned between water and EtOAc and layers separated. The organic layer was washed with sat. sodium bicarbonate solution, water, brine and dried over magnesium sulfate. The solvent was removed and the residue was purified by flash chromatography eluting with 2% MeOH in DCM to 3% MeOH in DCM. MS (ESP): 307 (M+H+) for C13H14N4O3S; NMR: 1.09 (t, 3H), 3.16-3.22 (m, 2H), 3.86 (s, 3H), 7.60 (d, 1H), 7.79 (t, 1H), 8.27 (dd, 1H), 8.49 (s, 1H), 8.83 (s, 1H), 9.56 (s, 1H).