Epoxidations with triphenylphosphine and diethyl azodicarboxylate. Part 1. Synthesis of methyl 3,4-anhydro-D-tagatofuranosides
作者:R. D. Guthrie、Ian D. Jenkins、Ryohei Yamasaki、Brian W. Skelton、Allan H. White
DOI:10.1039/p19810002328
日期:——
β-D-fructofuranoside (6) with triphenylphosphine and diethyl azodicarboxylate in dimethylformamide gives a high yield of methyl 3,4-anhydro-β-D-tagatofuranoside (5); no blocking of the hydroxy-groups at C-1 and C-6 is necessary. The structure of the product was confirmed by an X-ray structural study of its 1,6-bis-O-(p-tolylsulphonyl) derivative and by an unambiguous synthesis. A similar reaction of methyl α-D-fructofuranoside
用三苯基膦和偶氮二羧酸二乙酯在二甲基甲酰胺中处理甲基β- D-果糖呋喃糖苷(6),得到高产率的甲基3,4-脱水-β - D - tagato呋喃糖苷(5);不需要封闭C-1和C-6处的羟基。通过对其1,6-双-O-(对甲苯磺酰基)衍生物的X射线结构研究和明确的合成证实了产物的结构。的甲基α-类似的反应d -fructofuranoside,得到3,4-脱水α- d -tagatofuranoside。讨论了反应机理。