2-Chloroethyl isocyanate → N-(2-Chloroethyl)-N'-[4-(4-hydroxybutyl)phenyl]urea

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Reaction Steps

To a solution of 4-(p-amino phenyl)butanol (2 g in 125 mL of ethyl ether) is added dropwise 1.25 g of 2-chloroethyl isocyanate. This solution is stirred for 3 h at room temperature, cooled at -20° C., and filtered. A white solid of 4-{p-[3-(2-chloroethyl)ureido]phenyl}butanol is separated and recrystallized from ethanol (white flakes), yield 55%, mp 123°-124° C., IR (KBr pellet): 3300 (NH), 1730 (C=O, ester), and 1640 cm-1 (C=O, ureido); 1H NMR (DMSO-d6): 8.65 (s, 1p, ArNH), 7.4-7.0 (dd, 4p, p-substituted Ar), 6.4 (broad t, 1p, NHCH2), 3.7-3.4 (m, 6p, ArCH2 and NHCH2CH2Cl), 2.85 (t, 2p, CH2OH), 2.3 (s, 1p, CH2OH), 1.85 (q, 2p CH2 CH2CH2), 1.45 (q, 2p, CH 2CH2OH)

Provenance & Evidence