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With triethylamine; In isopropyl alcohol; at 180.0℃; for 1.0h;Microwave irradiation;
B. Preparation of 4-methyl-1-(5-methyl-7H-pyrrolo[2,3-d]pyrimidin-4yl)-piperidine-4-carboxylic acid. To a solution of 4-chloro-5-methyl-7H-pyrrolo[2,3-d]pyrimidine (0.274 g, 1.64 mmol) in isopropanol (10 mL) were added 4-methylpiperidine 4-carboxylic acid hydrochloric acid from step A (0.294 g, 1.64 mmol) and triethylamine (0.654 mL, 4.92 mmol). The reaction was heated to 180 C. for 1 hour under microwave conditions, concentrated, taken up with ice water, and neutralized to pH 3 with 6 N aq. HCl to precipitate the product. The product was collected by filtration and dried under vacuum overnight to give the title compound (0.42 g, 75%) as a gray solid. MS (ES+) [M+H]+=275.2.
With hydrogenchloride; In 1,4-dioxane; ethanol; at 110℃; for 10h;
General procedure: A mixture comprising 60.0 mg (307 mumol) 4-chloro-6-ethyl-5-methyl-7H-pyrrolo[2,3-d]pyrimidine (prepared according to intermediate exampLe 1a), 51 mg <strong>[56354-98-4]6-amino-1,3-benzothiazol-2(3H)-one</strong> (CAS-No: 56354-98-4), 1.75 mL ethanol and 16.9 muL hydrochloric acid (4M in dioxane) was reacted at 110C for 10 hours. The residue was digested in a mixture of diethyl ether and ethanol and dried to give 85.3 mg (85%) of the title compound.
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