Tetramethyl orthocarbonate → 2-(1-((2-(2-methoxy-1H-benzo[d]imidazol-1-yl)-9-methyl-6-morpholino-9H-purin-8-yl)methyl)piperidin-4-yl)propan-2-ol

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Following the procedures for 179, 2-(1-((2-(2-aminophenylamino)-9-methyl-6-morpholino-9H-purin-8-yl)methyl)piperidin-4-yl)propan-2-ol, tetramethylorthocarbonate and acetic acid were reacted to give 166. LCMS: M+H+=521.3. 1H-NMR (400 MHz, DMSO-d6): δ 7.83 (m, 1H), 7.48 (m, 1H), 7.18 (m, 2H), 4.23 (s, br, 4H), 4.15 (s, 3H), 4.02 (s, 1H), 3.80 (s, 3H), 3.76 (m, 4H), 3.72 (s, 2H), 2.87 (m, 2H), 1.99 (m, 2H), 1.65 (m, 2H), 1.20 (m, 3H), 1.02 (s, 6H)

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