Sodium t-butoxide → 4-[4-(2-Methyl-6-[1,2,4]triazol-1-yl-pyridin-3-ylamino)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid tert-butyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 4-(4-chloro-pyrazolo[3,4-d]pyrimidin-1-yl)-piperidine-1-carboxylic acid tert-butyl ester (Intermediate 19; 50 mg, 0.15 mmol), 2-methyl-6-[1,2,4]triazol-1-yl-pyridin-3-ylamine (Intermediate 7, Step 2; 26 mg, 0.15 mmol), palladium(II) acetate (0.3 mg, 0.01 eq), triisobutylphosphatrane (1 mg, 0.02 eq) and sodium tert-butoxide (34 mg, 0.36 mmol) in dimethylformamide (2 mL) was heated in the microwave oven at 160° C. for 10 min. The mixture was filtered through a PTFE filter with a 0.45 μM pore size to remove the catalyst, and the solid was rinsed with ethyl acetate. Ethyl acetate and water were added to the combined filtrate and washings, and the aqueous layer was extracted twice with ethyl acetate. The ethyl acetate layers were combined, evaporated, and purified by preparative C18 HPLC, eluting with 10-100% acetonitrile/water. Samples containing the product were extracted twice with dichloromethane and the solvent was evaporated to give 4-[4-(2-methyl-6-[1,2,4]triazol-1-yl-pyridin-3-ylamino)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid tert-butyl ester (18 mg, 26%) as a light yellow powder. 1H NMR (300 MHz, DMSO-d6) δ 1.43 (s, 9H), 1.75-2.07 (m, 4H), 2.99 (br s, 2H), 3.98-4.15 (m, 2H), 4.77-5.00 (m, 1H), 7.77 (d, 1H, J=8.5 Hz), 8.04-8.15 (m, 2H), 8.30 (s, 2H), 9.33 (s, 1H), 10.00 (br s, 1H). Mass spectrum (ES) MH+=477. HRMS Calcd. for C23H29N10O2 (MH+): 477.2470. Found: 477.2468.

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