[C:1]([O:5][C:6](=[O:21])[CH:7]([CH2:11][CH2:12][O:13][CH2:14][C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)[C:8](O)=O)([CH3:4])([CH3:3])[CH3:2].N1CCCCC1.C=O.Cl>N1C=CC=CC=1>[C:1]([O:5][C:6](=[O:21])[C:7]([CH2:11][CH2:12][O:13][CH2:14][C:15]1[CH:16]=[CH:17][CH:18]=[CH:19][CH:20]=1)=[CH2:8])([CH3:4])([CH3:2])[CH3:3]A solution of 2-(2-benzyloxyethyl) malonic acid mono tert-butyl ester (23.9 g, 81.2 mmol), piperidine (1.31 mL, 13.2 mmol), and paraformaldehyde (3.7 g, 123 mmol) in pyridine (160 mL) was heated at a temperature of 70° C. for 3 hours. After cooling to room temperature, the mixture was poured over ice. The mixture was acidified using 6N HCl solution and then extracted twice with ether; the extracts were combined, washed with brine, dried over MgSO4 and concentrated under vacuum to leave an oil. The oil was chromatographed on silica gel using 6% ethyl acetate in hexane to afford 2-(2-benzyloxyethyl)acrylic acid tert-butyl ester as a clear oil, 18.51 g (87%).
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