with trimethylsilyl cyanide in acetonitrile in the presence of stannous chloride gave the respective 1,2-O-(1-cyanoethylidene) derivatives. Triphenyl-methylium perchlorate-catalysed glycosylation of trityl ethers of monosaccharides by the above cyanoethylidene derivatives and by 3,5-di-O-benzoyl-1,2-O-(α-cyanobenzylidene)-β-l-arabinofuranose gave high yields of protected disaccharides containing a
在
氯化亚锡存在下,在
乙腈中用三甲基甲
硅烷基
氰化物处理乙酰化的1-阿拉伯
呋喃糖,d-半
乳糖呋喃糖和d-
葡萄糖呋喃糖,分别得到1,2-O-(1-
氰基亚乙基)衍
生物。上述
氰基亚乙基衍
生物和3,5-二-O-苯甲酰基-1,2-O-(α-
氰基苄叉基)-β-1-阿拉伯
呋喃糖的三苯基甲基
高氯酸盐催化的
单糖三苯甲基醚的糖基化反应产生了高收率的被保护的含有1,2-反式-
呋喃糖苷键的二糖。