[C:1]([O:5][C:6]([N:8]1[CH2:11][CH:10]([O:12][C:13]2[CH:18]=[C:17]([Cl:19])[CH:16]=[CH:15][C:14]=2[OH:20])[CH2:9]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[O:21]1[CH2:25][CH2:24][CH:23]([CH2:26]O)[CH2:22]1.C(C=P(CCCC)(CCCC)CCCC)#N>C1(C)C=CC=CC=1>[C:1]([O:5][C:6]([N:8]1[CH2:9][CH:10]([O:12][C:13]2[CH:18]=[C:17]([Cl:19])[CH:16]=[CH:15][C:14]=2[O:20][CH2:26][CH:23]2[CH2:24][CH2:25][O:21][CH2:22]2)[CH2:11]1)=[O:7])([CH3:4])([CH3:2])[CH3:3]A mixture of 3-(5-chloro-2-hydroxy-phenoxy)-azetidine-1-carboxylic acid tert-butyl ester (0.5 mmol), tetrahydro-furan-3-yl-methanol (0.5 mmol), and cyanomethylenetri-n-butylphosphorane (0.5 mmol) in toluene (3 mL) was heated at 120° C. in a microwave reactor for 1 h. The mixture was cooled to rt and purified via PTLC providing 3-[5-chloro-2-(tetrahydro-furan-3-ylmethoxy)-phenoxy]-azetidine-1-carboxylic acid tert-butyl ester (120 mg). To this compound was added CH2Cl2 (20 mL) and TFA (3 mL). After 4 h at rt the mixture was concentrated to give the title compound (161 mg). MS (ESI): mass calcd. for C14H18ClNO3, 283.1; m/z found, 284.0 [M+H]+. 1H NMR (MeOD): 7.05-6.96 (m, 2H), 6.88 (d, J=1.9 Hz, 1H), 5.15-5.05 (m, 1H), 4.57-4.48 (m, 2H), 4.28-4.19 (m, 2H), 4.04-3.88 (m 4H), 3.82-3.70 (m 2H), 2.82-2.70 (m, 1H), 2.20-2.09 (m, 1H), 1.84-1.73 (m, 1H).
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