反应详情

This compound was prepared in a procedure similar to the one described in Example 4. From 3-ethoxy-4-tert-butylamino-cyclobut-3-ene-1,2-dione (0.22 g, 1.1 mmol) and 2,4-dichloro-6-methylbenzylamine (0.22 g, 1.2 mmol, containing approximately 5% of a compound which is regioisomeric with respect to the substitution on the aryl ring) in absolute ethanol (5.5 mL) there was obtained 0.34 g (89%) of 3-tert-butylamino-4-(2,4-dichloro-6-methyl-benzylamino)-cyclobut-3-ene-1,2-dione as a white solid, which contains approximately 5% of a compound which is regioisomeric with respect to substitution on the aryl ring: mp 264°-268° C.; 1H NMR (DMSO-d6) δ 7.54 (d, 1H), 7.46 (s, 1H), 7.43 (br t, 1H), 7.39 (d, 1H), 4.89 (d, 2H), 4.72 (d, minor isomer), 2.40 (s, 3H), 2.31 (s, minor isomer), 1.34 (s, 9H) ppm. IR (KBr): 3200, 2950, 1800, 1650 cm-1 ; MS (m/z) 340/342/344 (M+).

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