作者:Pietro Allevi、Paola Rota、Raffaella Scaringi、Raffaele Colombo、Mario Anastasia
DOI:10.1021/jo100732j
日期:2010.8.20
The chemoselective synthesis of the 1,7-lactones of N-acetylneuraminic acid, N-glycolylneuraminic acid, and 3-deoxy-d-glycero-d-galacto-nononic acid is accomplished in two steps: a simple treatment of the corresponding free sialic acid with benzyloxycarbonyl chloride and a successive hydrogenolysis of the formed 2-benzyloxycarbonyl 1,7-lactone. The instability of the 1,7-lactones to protic solvents
的1,7-内酯的化学选择性合成Ñ -acetylneuraminic酸,Ñ -glycolylneuraminic酸,和3-脱氧d -glycero- d-半乳糖-壬酸分两个步骤完成:用苄氧羰基氯对相应的游离唾液酸进行简单处理,然后对形成的2-苄氧羰基1,7-内酯进行连续氢解。还已经证明了1,7-内酯对质子溶剂的不稳定性以及在酰化条件下其形成机理的合理化。结果允许处理纯的1,7-唾液酸内酯用作参考标准品,以及用于制备其同位素同质物的方法,以用作改进的气相色谱-质谱(GLC-)分析程序的内标MS)分析生物介质中的1,7-唾液酸内酯。