Syntheses of hepta-, hexa-, and penta-pivalates of trehalose by selective pivaloylation
作者:Raul Cortes Garcia、Leslie Hough、Anthony C. Richardson
DOI:10.1016/0008-6215(90)84199-5
日期:1990.4
trehalose with pivaloyl chloride is HO-6,6′ > HO-2,2′ > HO-3,3′ > HO-4,4′. Under the appropriate conditions of pivaloylation, heptapivalates with either HO-4 or HO-3 free, hexapivalates with either HO-4,4′ or HO-3′,4 free, and pentapivalates with HO-3′,4,4′ free were obtained. In addition, selective pivaloyation of trehalose 2,2′,3,3′-tetrapivalate afforded the 4,4′-diol and the non-symmetrical 4,4′,6′-triol
摘要海藻糖的八个羟基与新戊酰氯的酯化顺序为:HO-6,6'> HO-2,2'> HO-3,3'> HO-4,4'。在适当的吡咯戊酸酯化条件下,不含HO-4或HO-3的七戊酸酯,不含HO-4,4'或HO-3',4的六戊酸酯和不含HO-3',4,4'的戊戊酸酯获得了。另外,对海藻糖2,2',3,3'-四新戊酸酯进行选择性的空化,得到了4,4'-二醇和非对称的4,4',6'-三醇。4-ol是主要的庚二甲酸酯,是合成4-azido-4-deoxy-和4-amino-4-deoxy-trehalose以及它们的4-epimers和4-chloro-4的便捷原料。 -脱氧-α-d-吡喃半乳糖基α-d-吡喃葡萄糖苷。4,4',6'-三醇被用作4,6-二氯-4的合成前体