作者:Chyi-Cheng Chen、Roy L. Whistler
DOI:10.1016/0008-6215(88)84148-x
日期:1988.5
-sorbofuranoside, which was tosylated to give methyl 4,6- O -isopropylidene-1,3-di- O - p -tolylsulfonyl-α- l -sorbofuranoside. Removal of the isopropylidene protecting group and formation of a 3,4-anhydro-ring afforded methyl 3,4-anhydro-1- O - p -tolyl-sulfonyl-α- l -tagatofuranoside, which was converted into l -fructose ( 7 ) by acid hydrolysis. In an alternative, facile synthesis, 1 was converted, in
摘要将1-山梨糖(1)转化为4,6-O-异亚丙基-α-L-山梨醇呋喃糖苷,将其甲苯磺酸化,得到4,6-O-异亚丙基-1,3-二-O-对-甲苯磺酰基甲基-α-l-呋喃呋喃糖苷。除去异亚丙基保护基并形成3,4-脱水环,得到甲基3,4-脱水-1-O-对甲苯磺酰基-α-1-tag-呋喃呋喃糖苷,将其转化为1-果糖(7 )经酸水解。在替代的容易的合成中,在氯化锡(II)作为催化剂的存在下,将1转化为1,2:4,6-二-O-异亚丙基-α-1-山梨糖醛酸。选择性除去4,6-O-异亚丙基,然后形成3,4-脱水环,得到3,4-脱水-1,2-O-异亚丙基-α-1-taga呋喃糖。通过碱催化打开脱水环并除去1,