Butyl isocyanate → 3-Butyl-1-cyclopentyl-7-methoxy-1H-pyrimido[5,4-c]quinoline-2,4-dione

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Reaction Steps

3-Butyl-1-cyclopentyl-7-methoxy-1H-pyrimido[5,4-c]quinoline-2,4-dione (26 mg) was prepared from 4-cyclopentylamino-8-methoxy-quinoline-3-carboxylic acid ethyl ester (0.10 mmol) and butyl isocyanate (0.4 mmol) following general procedure C. LCMS: m/z 368 [M+1]+. 1H NMR (400 MHz, CDCl3): δ 9.47 (s, 1H), 7.81 (d, 1H), 7.57 (t, 1H), 7.23 (d, 1H), 4.99 (p, 1H), 4.14 (s, 3H), 4.06 (t, 2H), 2.42 (m, 2H), 2.08 (m, 4H), 1.69 (m, 4H), 1.44 (q, 2H), 0.97 (t, 3H) ppm.

Provenance & Evidence