An approach to 8 stereoisomers of homonojirimycin from d-glucose via kinetic & thermodynamic azido-γ-lactones
作者:Andreas F. G. Glawar、Sarah F. Jenkinson、Scott J. Newberry、Amber L. Thompson、Shinpei Nakagawa、Akihide Yoshihara、Kazuya Akimitsu、Ken Izumori、Terry D. Butters、Atsushi Kato、George W. J. Fleet
DOI:10.1039/c3ob41334a
日期:——
Crystal structures were obtained for the two C2 epimeric azido-γ-lactones 2-azido-2-deoxy-3,5:6,7-di-O-isopropylidene-D-glycero-D-ido-heptono-1,4-lactone and 2-azido-2-deoxy-3,5:6,7-di-O-isopropylidene-D-glycero-D-gulo-heptono-1,4-lactone prepared from kinetic and thermodynamic azide displacements of a triflate derived from D-glucoheptonolactone. Azido-γ-lactones are very useful intermediates in the synthesis of iminosugars and polyhydroxylated amino acids. In this study two epimeric azido-heptitols allow biotechnological transformations via Izumoring techniques to 8 of the 16 possible homonojirimycin analogues, 5 of which were isolated pure because of the lack of stereoselectivity of the final reductive amination. A side-by-side glycosidase inhibition profile of 11 of the possible 16 HNJ stereoisomers derived from D-glucose and D-mannose is presented.
获得两种 C2 差向叠氮-γ-内酯 2-叠氮-2-脱氧-3,5:6,7-二-O-异丙叉-D-甘油-D-ido-庚酮-1,4- 的晶体结构内酯和 2-叠氮基-2-脱氧-3,5:6,7-二-O-异亚丙基-D-甘油-D-古洛-庚酮-1,4-内酯由三氟甲磺酸酯的动力学和热力学叠氮化物置换制备来自D-葡萄糖庚酸内酯。叠氮基-γ-内酯是亚氨基糖和多羟基氨基酸合成中非常有用的中间体。在这项研究中,两种差向异构叠氮庚醇允许通过 Izumoring 技术对 16 种可能的高野尻霉素类似物中的 8 种进行生物技术转化,其中 5 种由于最终还原胺化缺乏立体选择性而被分离纯化。提出了衍生自 D-葡萄糖和 D-甘露糖的 16 种可能的 HNJ 立体异构体中的 11 种的并列糖苷酶抑制谱。