C(OC([NH:8][C@H:9]([C:15]([OH:17])=[O:16])[CH2:10][Si:11]([CH3:14])([CH3:13])[CH3:12])=O)(C)(C)C.[CH3:18][Si]([Cl:22])(C)C>CO>[ClH:22].[CH3:18][O:17][C:15](=[O:16])[C@H:9]([CH2:10][Si:11]([CH3:12])([CH3:13])[CH3:14])[NH2:8]The compound of Example 6A (300 mg) is dissolved in methanol (3 ml) and cooled to 0° C. Trimethylsilyl chloride (590 mg, 4.7 eq.) is added dropwise in the course of 30 min. and the mixture is warmed to RT overnight. The volatile components are removed on a Rotavapor and subsequently under high vacuum. The target compound (224 mg, 92% of th.) is obtained.
読み込み中…