2,4-Dichlorobenzylamine → 3-(2,4-Dichlorobenzylamino)-4-(1,2,2-trimethylproylamino)-cyclobut-3-ene-1,2-dione

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Reaction Steps

Tetrahydrofuran (10 mL), 3-butoxy-4-(1,2,2-trimethyl-propylamino)-cyclobut-3-ene-1,2-dione (1.01 g, 3.99 mmol, Example 1) and 2,4-dichlorobenzylamine (0.70 g, 4.0 mmol) were stirred together at room temperature for 14 hours. Following removal of solvent, the residue was triturated with diethyl ether and dried. The off-white solid product was recrystallized twice from nitromethane to yield 0.408 g (29%) of the title compound as a white solid: mp 234°-235° C.; 1H NMR: (DMSO-d6): δ 7.67 (m, br, 1H), 7.65 (m, br, 1H), 7.48 (m, 2H), 7.32 (m, br, 1H), 4.80 (m, 2H), 3.90 (m, 1H), 1.10 (d, 3H), 0.86 (s, 9H) ppm. IR (KBr): 3140, 1790, 1640 cm-1 ; MS (m/z): 354/356/358. HPLC indicates a major component (99%).

Provenance & Evidence