(2S,3S)-2-Amino-1,3-butanediol → (2R,3R)-2-(1,3-dihydroxybut-2-ylamino)-8-isopropyl-4-[4-(pyridin-2-yl)benzylamino]pyrazolo[1,5-a]-1,3,5-triazine

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Reaction Steps

According to the same conditions resulting in the preparation of the compound 2, the compound 12 is prepared from IIa.2 by oxidation reaction of the sulfur atom and then introduction of D-threoninol. Yield=42%, Oil. 1H NMR (300 MHz, CDCl3): δ 8.69 (d, 1H, J=4.7 Hz, Harom), 7.97 (d, 2H, J=8.3 Hz, Harom), 7.78-7.69 (m, 2H, Harom) 7.63 (s, 1H, 1H, Harom), 7.45 (d, 2H, J=8.3 Hz, Harom), 7.26-7.21 (m, 1H, Harom), 6.71 (bs, 1H, NH), 5.62 (d, 1H, J=6.6 Hz, NH), 4.77 (d, 2H, J=6.0 Hz, CH2), 4.22-4.15 (m, 1H, CH), 3.97-3.84 (m, 3H, CH 4-CH2), 3.01 (hept, 1H, J=7.0 Hz, CH), 1.29 (d, 3H, J=6.2 Hz, CH3), 1.28 (d, 6H, J=7.0 Hz, 2 CH3). MS (EST): m/z 448 (MH+).

Provenance & Evidence