Nucleophilic displacement-reactions of the 4-sulfonyloxy group in derivatives having the d-manno configuration
作者:Daniel Cicero、Oscar Varela、Rosa M. de Lederkremer
DOI:10.1016/0008-6215(91)80099-9
日期:1991.4
4-di-O-benzoyl-6-deoxy-α-d-talopyranoside (18), and methyl 2,4-di-O-benzoyl-6-deoxy-α-d-talopyranoside (19), which are evidently formed by intramolecular displacement of the 4-sulfonate by backside attack of the C-2 benzoyloxy substituent, followed by benzoyl migration. The structure of compounds 17–19 was established by spectroscopic analysis, and then chemically confirmed. Although compound 14 decomposed
制备了甲基2,3-二-O-苯甲酰基-6-脱氧-4-O-(对甲苯磺酰基)和4-O-[(对硝基苯基)磺酰基]-α-d-甘露吡喃糖苷(9和10)。通过甲基α-d-甘露吡喃糖苷的三种不同途径得到(1)。还从1合成了类似的具有HO-2和HO-3游离(14和15)的4-磺酰氧基衍生物。在N,N-二甲基甲酰胺中用硫氰酸钾亲核取代9、10、14和15的磺酰氧基。被尝试了。化合物9和10得到溶剂分解产物的混合物:2,3-二-O-苯甲酰基-6-脱氧-α-d-塔洛吡喃糖苷甲基(17),3,4-二-O-苯甲酰基-6-脱氧-甲基-甲基。 α-d-talopyranoside(18)和2,4-二-O-苯甲酰基-6-脱氧-α-d-talopyranoside甲基(19),显然是由4-磺酸盐的分子内置换引起的。 C-2苯甲酰氧基取代基,随后苯甲酰迁移。化合物17–19的结构通过光谱分析确定,然后化学确认。尽管化合物14在