Triethylamine → 4-Phenylbutyl 2-(N-cyclohexylcarbamoyl)-perhydropyridazinecarboxylate

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Reaction Steps

Cyclohexylisocyanate (0.38 g, 3.0 mmol) was added to a CH2Cl2 solution containing 4-phenylbutyl perhydropyridazinecarboxylate (0.72 g, 2.75 mmol) and triethylamine (0.42 ml, 3 mmol). The reaction was stirred overnight at room temperature under nitrogen atmosphere, and then diluted to 50 ml CH2Cl2. The organic layer was washed with water, dried, and concentrated. The crude material was purified by silica gel column to yield 0.95 g (89%) final product as clear oil. Rf=0.28 (2:1 hexane:EtOAc). 1H NMR (CDCl3, 400 MHz): δ 1.10 (m, 3H); 1.33 (m, 3H); 1.69 (m, 10H); 1.88 (m, 2H); 2.62 (m, 2H); 2.72 (m, 1H); 2.87 (m, 1H); 3.60 (m, 1H); 4.13 (m, 3H); 4.38 (m, 1H); 5.11 (d, 1H, J=8.3); 7.23 (m, 5H). Anal. Calcd. for C22H28N3O3-0.14H2O: C, 67.75; H, 8.60; N, 10.77. Found: C, 67.75; H, 8.45; N, 10.90.

Provenance & Evidence