The effect of replacing a 3-O-acetyl group by a 3-O-benzyl group in a methyl 4-O-trityl-β-d-xylopyranoside derivative on the efficiency of 1,2-trans-glycosylation with a d-xylose 1,2-O-(1-cyanoethylidene) derivative
作者:Nikolay E. Nifant'ev、Leon V. Backinowsky、Nikolay K. Kochetkov
DOI:10.1016/0008-6215(89)85042-6
日期:1989.8
Abstract Replacement of AcO-3 in methyl 2,3-di- O -acetyl-4- O -trityl-β- d -xylopyranoside with a benzyl group greatly increases the 1,2- trans -stereoselectivity of glycosylation with a d -xylopyranose 1,2- O -(1-cyanoethylidene) derivative. Anomerisation of methyl 2- O -benzyl-β- d -xylopyranoside derivatives occurred under the action of triphenylmethylium perchlorate.
摘要用苄基取代2,3-二-O-乙酰基-4-O-三苯甲基-β-d-吡喃吡喃糖苷中的AcO-3大大提高了ad-吡喃吡喃糖1糖基化反应的1,2-反式-立体选择性。 ,2-O-(1-氰基亚乙基)衍生物。在高氯酸三苯基甲酯的作用下,甲基2-O-苄基-β-d-吡喃吡喃糖苷衍生物发生了异构化。