Isobutyl chloroformate → 4-[4-(4-Methanesulfonyl-phenoxy)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid isobutyl ester

Beteiligte Stoffe

Reaktionsschritte

4-[4-(4-Methanesulfonyl-phenoxy)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid isobutyl ester was prepared according to General Procedure E by the reaction of 4-(4-methanesulfonyl-phenoxy)-1-piperidin-4-yl-1H-pyrazolo[3,4-d]pyrimidine trifluoroacetate salt (Intermediate 27) with isobutyl chloroformate (available from Aldrich Chemical Company, Inc., Milwaukee, Wis., USA). 1H NMR (400 MHz, DMSO-d6) δ 0.91 (d, 6H, J=6.7 Hz), 1.86-2.09 (m, 6H), 3.04-3.16 (m, 2H), 3.30 (methyl sulfonyl and water peak), 3.82-3.84 (m, 2H), 4.12-4.16 (m, 2H), 5.02-5.08 (m, 1H), 7.62-7.64 (m, 2H), 8.05-8.07 (m, 2H), 8.38 (s, 1H), 8.57 (s, 1H). Mass spectrum MH+=474.

Herkunft & Nachweise