N1C=CN=C1.[C:6]([Si:10]([CH3:13])([CH3:12])Cl)([CH3:9])([CH3:8])[CH3:7].CN(C)C=O.[OH:19][CH:20]1[CH2:24][CH2:23][NH:22][C:21]1=[O:25]>O>[Si:10]([O:19][CH:20]1[CH2:24][CH2:23][NH:22][C:21]1=[O:25])([C:6]([CH3:9])([CH3:8])[CH3:7])([CH3:13])[CH3:12]In an ice bath, 300 mg of imidazole and 497 mg of tert-butyldimethylchlorosilane were added to a dimethylformamide (2 ml) solution of 255 mg of 3-hydroxypyrrolidin-2-one, and stirred for 1 hour. Water was added to the reaction liquid, extracted with ethyl acetate, and washed with hydrochloric acid (1 N) and saturated saline water. The organic layer was dried to obtain 370 mg of a crude product. 208 g of the product was purified through silica gel column chromatography (developing solvent: hexane/ethyl acetate=9/1 to 2/8) to obtain 62 mg of the entitled compound as a white solid.
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