摘要从2,3,4,6-四-O-苄基-d-甘露糖肟经六步合成了一种新型的甘露糖苷酶抑制剂“ Mannonojiretetrazole”(7)。X射线分析已确定7的结构。7的固态构象是6 H 7(= 4 H 3,根据碳水化合物命名法编号),CD 3 OD中的构象接近S 7(sofa; = S 3,根据碳水化合物命名法编号),而先前合成的具有葡萄糖构型(6)的类似物的构型为6 H 7,无论是固态还是在D 2 O或CD 3 OD中。已经测试了6和7作为一系列5种α-和β-葡糖苷酶和-甘露糖苷酶以及β-半乳糖苷酶的抑制剂,并且已经确定了抑制常数。良好的相关性(ϱ = 0。在每个抑制剂-酶对的log K i与相应底物-酶对的log(V m / K m)之间发现了9),从而为任何糖苷酶抑制剂是过渡态类似物提供了第一个此类证据。这清楚地证明了糖苷酶的真正过渡态类似物抑制剂具有构型选择性的情况。
Stereocontrolled Debenzylative Cycloetherification Reaction as a Route to Enantiopure <i>C</i>-Furanosides with Amino Substituents in the Side Chain
作者:Karolina Tiara、Mykhaylo A. Potopnyk、Paweł Świder、Sławomir Jarosz
DOI:10.1021/acs.joc.9b03247
日期:2020.3.6
A highly efficient methodology of the preparation of synthetically important tetrahydrofuran derivatives with an amino substituent in the side chain is reported. This process is based on the stereocontrolled debenzylative cycloetherification (DBCE) reaction applied for chirons from the d-gluco- and d-manno-series and provides derivatives with new stereogenic centers. The influence of the electron-withdrawing
Deoxy-nitrosugars. 4th communication. Convenient synthesis of 1-deoxy-1-nitroaldoses
作者:Bernard Aebischer、Andrea Vasella
DOI:10.1002/hlca.19830660310
日期:1983.5.5
A new synthesis of 1-deoxy-1-nitroaldoses by ozonolysis of N-glycosylnitrones according to the procedure of Bailey et al. is described. Based on the oxime 1, the mannofuranosylnitrones 3–5 were obtained in yields of 86–88% and the 1-deoxy-1-nitromannose 6 in yields of 70–76%. In the same manner the 1-deoxy-1-nitroaldoses 9, 12, 18, and 19 were prepared in yields of 61–90% from the oximes 7, 10, 14