C([Si](C)(C)[O:6][CH:7]1[CH2:10][N:9]([C:11]2[CH:16]=[CH:15][C:14]([C@@H:17]([NH:19][C:20](=[O:22])[CH3:21])[CH3:18])=[CH:13][CH:12]=2)[CH2:8]1)(C)(C)C.[F-].C([N+](CCCC)(CCCC)CCCC)CCC>C1COCC1>[OH:6][CH:7]1[CH2:8][N:9]([C:11]2[CH:12]=[CH:13][C:14]([C@@H:17]([NH:19][C:20](=[O:22])[CH3:21])[CH3:18])=[CH:15][CH:16]=2)[CH2:10]12.6 g (7.46 mmol) (S)—N-(1-{4-[3-(tert-Butyl-dimethyl-silanyloxy)-azetidin-1-yl]-phenyl}-ethyl)-acetamide (IV.1) are added to 20 mL THF and the mixture is cooled to 5° C. 14.9 mL (14.9 mmol) tetrabutylammonium fluoride (1 N in THF) are added and the mixture is allowed to warm to rt. Stirring is continued for 1 h and the solvent is removed in vacuo. The residue is purified by column chromatography (silica gel; DCM:MeOH; gradient 9:1→8:2) to yield the desired product.
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