Triethylamine → 3-Oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-sulfonic acid {2-[4-(6-methoxy-[1,5]naphthyridin-4-yl)phenyl]ethyl}amide

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Reaction Steps

To a stirred solution of 2-[4-(6-Methoxy-[1,5]naphthyridin-4-yl)phenyl]ethylamine hydrochloride salt (0.10 g, 0.26 mmole), from Example 1a, in dry CH2Cl2 (25 mL) at RT was added triethylamine (0.11 mL, 0.78 mmole) and 3-oxo-3,4-dihydro-2H-benzo[1,4]thiazine-6-sulfonyl chloride (69 mg, 0.26 mmole). After 24 h, the reaction contents were concentrated. Purification on silica (CHCl3/MeOH, 9:1 containing 5% NH4OH) afforded the title compound (0.10 g, 75%) as light yellow solid: 1H NMR (400 MHz, CD3OD) δ 9.06 (d, J=4.5 Hz, 1H), 8.57 (d, J=9.0 Hz, 1H), 8.26 (d, J=4.6 Hz, 1H), 8.10 (d, J=9.1 Hz, 2H), 7.73 (m, 3H), 7.45 (d, J=9.0, 1H), 7.17 (m, 2H), 4.25 (s, 2H), 4.06 (s, 3H), 3.77 (m, 2H), 3.31 (m, 2H). LC-MS (ES) m/e 507 (M+H)+.

Provenance & Evidence