Cesium carbonate → HCID 44193424, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-bromo-N-(3-tert-butyl-isoxazol-5-yl)-2-methyl-propionamide (prepared according to method B, step 1, 2.0 g, 6.92 mmol) in anhydrous THF (40 mL) are added 4-aminotetrahydropyran (0.70 g, 6.92 mmol) and Cs2CO3. The reaction is heated to 60° C. for 48 h. After cooling the reaction mixture is partitioned between DCM (100 mL) and water (100 mL). The organic layer is separated and dried over Na2SO4. Filtration and concentration of the filtrate gives a yellow oil. The oil is dissolved in DCM and extracted with 1M aqueous HCl solution. The acidic aqueous extract is basified with 5M aqueous NaOH solution and extracted with DCM (3×100 mL). The combined organic extracts are dried over Na2SO4, filtered and the filtrate is concentrated under reduced pressure to give N-(3-tert-butyl-isoxazol-5-yl)-2-methyl-2-(tetrahydro-pyran-4-ylamino)-propionamide (0.89 g, 42%). m/z 310 [M+H+]. Conversion into its hydrochloride salt is achieved upon treatment with 1M HCl solution in diethyl ether (2.89 mL).

Provenance & Evidence