Water → Ethyl 2-[6-(3-ethyl-ureido)-pyridin-3-yl]-4-isopropylcarbamoyl-thiazole-5-carboxylate

Participants

Reaction Conditions

Reaction Steps

In a 10 mL of microwave vial, ethyl 2-chloro-4-isopropylcarbamoyl-thiazole-5-carboxylate (Intermediate 28, 1.1 g, 3.97 mmol), N-ethyl-N′-[5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-pyridin-2-yl]-urea (Intermediate 1, 1.15 g, 3.97 mmol), cesium carbonate (1.29 g, 3.97 mmol), Tetrakis (triphenylphosphino) palladium (0) (0.458 g, 0.397 mmol) in 15 mL of 4:1 dioxane:H2O was degassed for 30 min, then heated to 100° C. for 30 min. The reaction mixture was diluted with ethyl acetate (25 mL), then washed with water (10 mL). The organic layer was dried, then concentrated under reduced pressure to yield crude a residue which was purified by column chromatography over silica gel to afford 0.195 g (17.72%) of the title compound as solid. MS (APCI): 406 (M+H−) for C18H23N5O4S; NMR: 1.13 (t, 3H), δ 1.16 (d, 6H), 1.28 (t, 3H), δ 3.2 (q, 2H), 4.04 (m, 1H), 4.29 (q, 2H), 7.63 (d, 1H), 7.70 (br s, 1H), 8.27 (dd, 1H), δ 8.45 (d, 1H), 8.83 (d, 1H), 9.56 (s, 1H).

Provenance & Evidence