1,3,4-Thiadiazol-2-amine → 3-cyclopentyl-2-phenyl-N-[1,3,4]thiadiazol-2-yl-propionamide

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Reaction Steps

To 2-amino-1,3,4-thiadiazole (220 mg, 21 mmol), 0.4 mL DIEA and 7 mL of DCM is added a solution of the title C compound, 3-cyclopentyl-2-phenylpropionyl chloride (500 mg, 21 mmol) in 2 mL of DCM. The mixture is stirred at ambient temperature for 2-3 h, the mixture is evaporated, and the residue is treated with 10 mL 1 N HCl and extracted twice with ethyl acetate. The combined extracts are washed with brine, saturated sodium bicarbonate solution, and brine and dried over anhydrous magnesium sulfate. Filtration and evaporation afford 3-cyclopentyl-2-phenyl-N-[1,3,4]thiadiazol-2-yl-propionamide as an orange foam: 1H NMR (400 MHz, DMSO-d6) δ 11 (m, 2H), 1.4 (m, 2H), 1.5 (m, 3H), 1.7(m, 3H), 2.1 (ddd, J=13.3, 7.8, 7.7 Hz, 1H), 4.0 (dd, J=8.1, 7.1 Hz, 1H), 7.2 (s, 1H), 7.3 (m, 4H), 9.1 (s, 1H), 12.8 (s, 1H); LC/MS 302 (M+1), 300 (M−1).

Provenance & Evidence