6-[(3S,4S)-1-benzyl-4-ethylpyrrolidin-3-yl]-1-(tetrahydro-2H-pyran-4-yl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one → 6-[(3S,4S)-4-ethylpyrrolidin-3-yl]-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one

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Following the procedure for the preparation of 6-[(3S,4S)-4-methylpyrrolidin-3-yl]-1-(tetrahydro-2H-pyran-4-yl)-1H-pyrazolo[3,4-d]pyrimidin-4(5H)-one but substituting 6-[(3S,4S)-1-benzyl-4-ethylpyrrolidin-3-yl]-1-(tetrahydro-2H-pyran-4-yl)-1,5-dihydro-4H-pyrazolo[3,4-d]pyrimidin-4-one provided the title compound. 400 MHz 1H NMR (CD3OD) δ 8.02 (s, 1H), 4.97 (m, 1H), 4.09-4.06 (m, 2H), 3.78-3.58 (m, 4H), 3.34-3.34 (m, 1H), 3.16-3.11 (m, 1H), 2.68 (d, J=8.7 Hz, 1H), 2.63 (m, 1H), 2.32-2.27 (m, 2H), 1.90-1.87 (m, 2H), 1.69 (m, 1H), 1.57 (m, 1H), 0.97 (t, J=7.5 Hz, 3H). MS: (M+H m/z 318.2).

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