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

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4-[4-(4-Methanesulfonyl-phenoxy)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid ethyl 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 ethyl chloroformate (available from Aldrich Chemical Company, Inc., Milwaukee, Wis., USA). 1H NMR (400 MHz, DMSO-d6) δ 1.21 (t, 3H, J=7.1 Hz), 1.98-2.06 (m, 6H), 3.04-3.16 (m, 2H), 3.30 (methyl sulfonyl and water peak), 4.05-4.14 (m, 4H), 5.02-5.08 (m, 1H), 7.63-7.65 (m, 2H), 8.05-8.07 (m, 2H), 8.40 (s, 1H), 8.57 (s, 1H). Mass spectrum MH+=446.

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