Water → 1-(3-Cyclopentyl-propyl)-3-(4-nitro-phenyl)-1,3-dihydro-imidazol-2-one

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Reaction Conditions

Reaction Steps

The product from Example 48 (2.6 g, 12.1 mmol) was dissolved in CH2Cl2 (30 mL) and cooled to 0° C. 4-Nitrophenylisocyanate (1.98 g, 12.1 mmol) was added, and the mixture was allowed to warm to 23° C. The reaction was diluted with additional CH2Cl2 (30 mL) and cooled to 0° C. before a 1:1 solution of trifluoroacetic acid and water was added. The biphasic solution was vigorously stirred for 18 hours at ambient temperature. The layers were separated, and the aqueous layer was extracted with CHCl3. The combined organic layers were washed with saturated NaHCO3, brine, dried (MgSO4), and concentrated to a yellow solid. Mp 105-107° C. Rf=0.4 (2:1 hexanes/ethyl acetate); 1H NMR (300 MHz, DMSO-d6) δ 8.30 (d, 2H), 8.11 (d, 2H), 7.26 (d, 1H), 6.91 (d, 1H), 3.57 (t, 2H), 1.71 (m, 3H), 1.63 (m, 2H), 1.47 (m, 4H), 1.24 (m, 2H), 1.03 (m, 2H); MS (CI) m/z 316 (MH+).

Provenance & Evidence