Glycosidation of the myo-inositol derivatives 2 and 3 by the diazirine 1 yields 90% of a diastereoisomer pair of β-D-glycosides in a 1:1 ratio, i.e.5/6 and 7/8, respectively (Scheme 1). The crystal structure of 3 shows a strong intramolecular H-bond, which persists in solution, as indicated by FT-IR and 1H-NMR spectra. Yields and diastereoselectivity are lower for the glycosidation of 24 by 1 (Scheme
所述的糖苷化肌醇肌醇衍
生物2和3由二吖丙因1个在一个1产率90%对映异构体对β-d苷的:1分的比例,即5/6和7/8分别(方案1)。3的晶体结构显示出很强的分子内H键,如FT-IR和1 H-NMR光谱所示,其在溶液中持续存在。产率和非对映选择性是的糖苷化降低24由1(方案3)。分离得到的1,2-和1,4-连接的二糖25-28为
乙酸盐29–32。先前确定的24的晶体结构未显示分子内H键。24而不是3的糖苷化的产率取决于浓度,表明需要通过分子间H键激活24。2和3用三
氯乙酰亚
氨酸酯14糖苷化分别得到四种(5,6,15和16)和六种(7,8和17–20)二糖的混合物(方案2)。