Methanol → HCID 89422597, compound

Participants

Reaction Steps

To a solution of tert-butyl 3-carbamoyl-4-(6-carbamoyl-2-chloropyrimidin-4-yl)piperazine-1-carboxylate (4.744 g, 12.33 mmol) in dioxane (25 mL) was added 4M HCl in dioxane (5.0 mL, 20.0 mmol). After stirring overnight the reaction was diluted with additional dioxane (25 mL) and 4M HCl in dioxane (5.0 mL, 20.0 mmol). After 5 h, MeOH (10 mL) was added. After stirring overnight more MeOH (10 mL) was added. After stirring one more night the reaction was evaporated in vacuo to give crude 6-(2-carbamoylpiperazin-1-yl)-2-chloropyrimidine-4-carboxamide hydrochloride. The crude hydrochloride salt was suspended in THF (50 mL). To this was added iPr2NEt (7.10 mL, 40.8 mmol) and methyl iodide (0.85 mL, 13.7 mmol). The reaction vessel was sealed and heated at 70° C. for 5 h. The reaction mixture was cooled and partitioned between EtOAc (100 mL) and water (50 mL). The organics were isolated and saved. 1N aqueous NaOH was added to the aqueous layer then it was extracted with EtOAc (100 mL). These organics were also isolated and saved. Once more, 1N aqueous NaOH was added to the aqueous layer then it was extracted with EtOAc (100 mL). The organics were isolated and combined with the other batches of organic extracts. The combined organics were dried over Na2SO4, filtered, and evaporated in vacuo. The solid residue was triturated with MeOH (5 mL), filtered, and washed with MeOH (1×2 mL). The solid was dried under vacuum at 40° C. to give 6-(2-carbamoyl-4-methylpiperazin-1-yl)-2-chloropyrimidine-4-carboxamide as a cream-colored powder (0.924 g, 3.09 mmol, 25% yield). LC/MS: m/z=299.1 [M+H]+.

Provenance & Evidence