作者:Frieder W Lichtenthaler、Stefan Mondel
DOI:10.1016/s0008-6215(97)00173-0
日期:1997.9
triflation. S N 2-Displacement on the triflate by acetate ion (→ manno -sucrose) or azide ion (→ manno -sucrosamine) proceeded in high yields, and on exposure to deacetylation conditions displacement was effected by the liberated 3-OH resulting in the manno -sucrose-2,3-epoxide; ring opening of the latter epoxide with water, ammonia, or azide proceeded in diaxial fashion to provide altro -sucrose, and
摘要开发了制备上有用的程序,用于将吡喃糖部分中的甘露糖和α-构型的蔗糖转化为异构体。关键化合物是2-triflate-heptaacetate,它是通过标准的triflation从易于获得的3,4,6,1',3',4',6'-庚基-O-乙酰蔗糖生成的。SN 2-通过乙酸根离子(→甘露糖基蔗糖)或叠氮化物离子(→甘露糖基蔗糖胺)取代三氟甲磺酸酯,收率高,并且在脱乙酰基条件下,游离的3-OH取代产生了甘露聚糖-蔗糖-2,3-环氧化物; 后者与水,氨或叠氮化物的环氧化物的开环以双轴方式进行,分别提供了α-蔗糖及其3-氨基和3-叠氮基衍生物。甜度评估证明甘露糖蔗糖的甜度比蔗糖低约5倍,