Ethyl isothiocyanate → 1-Cyclopentyl-3-ethyl-7-methoxy-2-thioxo-2,3-dihydro-1H-pyrimido[5,4-c]quinolin-4-one

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1-Cyclopentyl-3-ethyl-7-methoxy-2-thioxo-2,3-dihydro-1H-pyrimido[5,4-c]quinolin-4-one (12 mg) was prepared from 4-cyclopentylamino-8-methoxy-quinoline-3-carboxylic acid ethyl ester (0.10 mmol) (prepared as described in Example 1) and ethyl isothiocyanate (0.4 mmol) following a procedure similar to general procedure C. LCMS: m/z 356 [M+1]+. 1H NMR (400 MHz, CDCl3): δ 9.50 (s, 1H), 7.74 (d, 1H), 7.53 (t, 1H), 7.21 (d, 1H), 5.03 (p, 1H), 4.09 (s, 3H), 4.07 (q, 2H), 2.42 (m, 2H), 2.08 (m, 4H), 1.64 (m, 2H) and 1.34 (t, 3H).

Provenance & Evidence