Efficient synthesis of differently protected methyl (ethyl 1-thio-β-d-glucopyranosid)uronates and their evaluation as glucuronic acid donors and acceptors
作者:Christian Krog-Jensen、Stefan Oscarson
DOI:10.1016/s0008-6215(98)00106-2
日期:1998.4
formation and rearrangement of a 1,2-thioorthoester, in a stereospecific and high-yielding manner. Dimethyl(methylthio)sulfonium trifluoromethanesulfonate (DMTST)-promoted glycosylations with these derivatives as donors gave high to excellent yields (59–95%) of exclusively β -linked disaccharides in coupling with monosaccharide acceptors. Removal of the tetraisopropyldisiloxyl acetal with tetrabutylammonium
摘要甲基[乙基2-O-乙酰基-3,4- O-(1,1,3,3-四异丙基-1,3-二硅氧烷-1,3-二基)-1-硫代-β-d-吡喃葡萄糖苷]尿酸盐(7)及其2-O-苯甲酰基和-pivaloyl类似物13和14是通过2,3,4-三-O-乙酰基-α-d-吡喃葡萄糖基尿酸溴甲烷的合成和重排合成的1,2-硫代原酸酯,具有立体定向和高产率的方式。这些衍生物为供体的二甲基(甲硫基))三氟甲磺酸盐(DMTST)促进的糖基化反应,与单糖受体结合时,纯β-连接二糖的收率高至极佳(59-95%)。从获得的一种二糖中用四丁基呋喃铵在四氢呋喃中除去四异丙基二甲硅烷氧基缩醛,得到3',4'-二醇,