[NH:1]1[CH2:6][CH2:5][CH:4]([CH2:7][C:8]([O:10][CH2:11][CH3:12])=[O:9])[CH2:3][CH2:2]1.C(N(CC)CC)C.[CH2:20](Cl)[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1>C(Cl)Cl>[CH2:20]([N:1]1[CH2:6][CH2:5][CH:4]([CH2:7][C:8]([O:10][CH2:11][CH3:12])=[O:9])[CH2:3][CH2:2]1)[C:21]1[CH:26]=[CH:25][CH:24]=[CH:23][CH:22]=1Ethyl 4-piperidylacetate was dissolved in 50 ml CH2Cl2 while chilling the mixture on an ice bath, 3.1 ml (22 mmol) triethylamine then benzyl chloride was added; the mixture was refluxed for 2 hours. After cooling the organic layer was extracted with water, brine and then dried over magnesium sulfate. After crystallization, 2.05 g of ethyl N-benzyl-4-piperidylacetate was obtained (Formula XI: Y'=CH2, alkyl=C2H5).
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