A new chemical approach to synthesizing human ABO histo-blood type 2 antigenic determinants was developed. N-Phthaloyl-protected lactosaminyl thioglycoside derived from lactulose via the Heyns rearrangement was employed to obtain a type 2 core disaccharide. Use of this scheme lowered the overall number of reaction steps. Stereoselective construction of the α-galactosaminide/galactoside found in A- and B-antigens, respectively, was achieved by using a unique di-tert-butylsilylene-directed α-glycosylation method. The proposed synthetic scheme provides an alternative to existing procedures for preparing ABO blood group antigens.
研究人员开发了一种新的
化学方法来合成人类 ABO 组织血型 2 型抗原决定簇。采用邻苯二甲酰保护
乳糖氨基
硫代糖苷(N-Phthaloyl-protected lactosaminyl thioglycoside),通过海恩斯重排(Heyns rearrangement)从
乳糖中获得 2 型核心二糖。采用这种方案减少了反应步骤的总数。通过使用独特的二叔丁基
硅基定向α-糖基化方法,立体选择性地构建了分别存在于 A 抗原和 B 抗原中的α-半
乳糖酰胺/半
乳糖苷。所提出的合成方案为制备 ABO 血型抗原提供了一种可替代现有程序的方法。