Synthesis of four diastereomeric octofuranoses from d-glucofuranurono-6,3-lactone via Grignard reactions
作者:Karl Dax、Martin Fechter、Günther Gradnig、Vera Grassberger、Carina Illaszewicz、Markus Ungerank、Arnold E. Stütz
DOI:10.1016/0008-6215(91)84117-w
日期:1991.9
hydride (DIBAL-H) to the respective hemiacetal at C-6, followed by reaction with vinylmagnesium bromide in either ether or tetrahydrofuran, gives the corresponding diastereomeric pairs of 7,8-dideoxyoct-7-eno-1,4-furanoses. The configurations of the products at C-6 were determined after oxidative cleavage of the terminal double bond and reduction of the aldehyde by conversion of the resulting heptoses
摘要用氢化二异丁基铝(DIBAL-H)还原5-O-叔丁基二甲基甲硅烷基-1,2-O-异亚丙基-α-d-葡萄糖-(2)-β-l-idofuranuronono-6,3-lactone(3) )在C-6下反应成各自的半缩醛,然后与乙烯基溴化镁在乙醚或四氢呋喃中反应,得到相应的7,8-二脱氧辛基-7-eno-1,4-呋喃糖酶的非对映异构体对。通过将所得的庚糖转化成已知的相应的过-O-乙酰化的庚糖醇,在末端双键的氧化裂解和醛的还原之后,确定C-6产物的构型。