Acetyl chloride → (R)-1-(3 acetyl-1,3,4,5-tetrahydropyrazolo[3,4,5-de][1,6]naphthyridin-7-yl)-3-(1-phenylethyl)urea

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Reaction Steps

(R)-1-(1-phenylethyl)-3-(1,3,4,5-tetrahydropyrazolo[3,4,5-de][1,6]naphthyridin-7-yl)urea (Example 136; 13 mg, 0.040 mmol) and triethylamine (50 mg, 0.494 mmol) were taken in DCM (0.15 mL) and added acetyl chloride (20 mg, 0.255 mmol) and stirred for 1 hour. The reaction mixture was diluted with DCM, washed with aqueous sodium bicarbonate, brine, dried with sodium sulfate and concentrated. Purification of the residue by flash column (0-15% MeOH-DCM) gave (R)-1-(3 acetyl-1,3,4,5-tetrahydropyrazolo[3,4,5-de][1,6]naphthyridin-7-yl)-3-(1-phenylethyl)urea. MS ESI calc'd. for C19H20N6O2 [M+H]+ 365. found 365. 1H NMR (ppm, 500 MHz, DMSO-d6) δ 12.35 (s, 1H), 9.13-9.05 (m, 1H), 8.05-7.86 (m, 1H), 7.39-7.28 (m, 6H), 7.27-7.18 (m, 1H), 3.06-2.96 (m, 2H), 1.38 (t, J=9.1, 3H), 1.25-1.18 (m, 2H).

Provenance & Evidence