2,2-Dimethylpropyl carbonochloridate → 4-[4-(4-Methanesulfonyl-phenoxy)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid 2,2-dimethyl-propyl ester

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4-[4-(4-Methanesulfonyl-phenoxy)-pyrazolo[3,4-d]pyrimidin-1-yl]-piperidine-1-carboxylic acid 2,2-dimethyl-propyl 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 trifluoro-acetate salt (Intermediate 27) with 2,2-dimethylpropyl chloroformate (available from Aldrich Chemical Company, Inc., Milwaukee, Wis., USA). 1H NMR (400 MHz, DMSO-d6) δ 0.93 (s, 9H), 1.98-2.01 (m, 4H), 3.00-3.10 (m, 2H), 3.30 (methyl sulfonyl and water peak), 3.70-3.80 (m, 2H), 4.14-4.17 (m, 2H), 5.03-5.09 (m, 1H), 7.63-7.65 (m, 2H), 8.05-8.07 (m, 2H), 8.37 (s, 1H), 8.57 (s, 1H). Mass spectrum MH+=488.

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