[Si:1]([O:8][C@H:9]1[CH2:13][N:12]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[C@H:11]([C:21](O)([CH3:23])[CH3:22])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].C(N(CC)CC)C.S(Cl)(Cl)=O>C1(C)C=CC=CC=1>[Si:1]([O:8][C@H:9]1[CH2:13][N:12]([C:14]([O:16][C:17]([CH3:20])([CH3:19])[CH3:18])=[O:15])[C@H:11]([C:21]([CH3:23])=[CH2:22])[CH2:10]1)([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:2])[CH3:3]To a solution of tert-butyl (2S,4R)-4-{[tert-butyl(dimethyl)silyl]oxy}-2-(2-hydroxypropan-2-yl)pyrrolidine-1-carboxylate (98 g) dissolved in toluene (900 mL) at −78° C. was added triethylamine (310 mL). The mixture was stirred at −78° C. for 10 minutes, and then thionyl chloride (60 mL) in toluene (100 mL) was added dropwise over 1.5 hours. The mixture was stirred at −78° C. for 2 hours and then quenched with saturated ammonium chloride. The aqueous layer was extracted with ethyl acetate, and the organic layer was washed with saturated aqueous sodium bicarbonate and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated to give tert-butyl (2S,4R)-4-{[tert-butyl(dimethyl)silyl]oxy}-2-(prop-1-en-2-yl)pyrrolidine-1-carboxylate. The residue was used directly without further purification.
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