Methanesulfonic Acid → HCID 178426277, compound

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Reaction Steps

A stirred suspension of 6-chloro-2-(4-methylanilino)-2,3,4,9-tetrahydro-1H-pyrrolo[3,4-b]quinoline-1,3,9-trione (1.60 g, 4.53 mM) in a solution of methanol (128 mL) and methanesulfonic acid (32 mL) was refluxed for 4 hours and cooled to room temperature. The resulting yellow suspension was stirred at room temperature for five days and then filtered (the filtrate was saved for use in Example 19). The collected solids were washed with methanol and then ether to give the title compound (0.594 g, 37%) as a yellow powder, mp >400° C.; MS(CI): 354 (M+H). Analysis for C18H12 ClN3O3 ·0.4 H2O: Calculated: C, 59.89; H, 3.57; N, 11.64; Found: C, 59.47; H, 3.14; N, 11.57; NMR: 13.34 (s, 1H exchangeable), 12.48 (s, 1H, exchangeable), 8.30 (d, J=8.75 Hz, 1H), 8.22 (br s, 1H), 7.62 (d, J=8.75 Hz, 1H), 7.55 (d, J=8.01 Hz, 2H), 7.33 (d, J=8.01 Hz, 2H), 2.38 (s, 3H).

Provenance & Evidence