[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([NH:17][CH2:18][CH3:19])[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[CH3:20][N:21]=[C:22]=[O:23]>C(Cl)(Cl)Cl>[CH2:1]([O:8][C:9]([N:11]1[CH2:16][CH2:15][CH:14]([N:17]([CH2:18][CH3:19])[C:22]([NH:21][CH3:20])=[O:23])[CH2:13][CH2:12]1)=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1A solution of 1-benzyloxycarbonyl-4-(N-ethylamino)piperidine (4.0 g) and methyl isocyanate (11 mL) was stirred for 30 hours at ambient temperature. The reaction mixture was diluted with chloroform and evaporated to give the urea as an oil; MS: m/z=320(M+1). The material was used without further purification.
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