2-O-(methoxyethylidene)-α-maltose (3b). Formation of a 2-OH derivative was promoted in strongly acidic solutions; however, the extent to which a given reactant formed a 2-OH product also was determined by structural features at sites remote from the reaction center. Control of solution acidity led to yields of the 2-OH form varying from 10 to 75% in series 1, from 51 to 95% in series 2, and from 9 to 40% in series 3
摘要确定了四-O-乙酰基-β-
D-吡喃葡萄糖酰
氯(1a),2,3-二- O-乙酰基4,6-O-亚乙基-β-
D-吡喃葡萄糖基
氯(2a)和七-O-乙酰基-β-
麦芽糖基
氯(3a),三-O-乙酰基-1,2-O-(乙氧基亚乙基)-α-
D-吡喃葡萄糖(1b)和六-O-乙酰基-1,2-O-(甲氧基亚乙基)-α-
麦芽糖(3b)。在强酸性溶液中促进了2-OH衍
生物的形成;然而,给定反应物形成2-OH产物的程度也由远离反应中心的位点的结构特征决定。控制溶液酸度导致2-OH形式的收率在系列1中从10到75%不等,在系列2中从51到95%不等,在系列3中从9到40%不等。为了证明这种产物混合物在2-O-取代的衍
生物的合成中的有用性。由1,3-二-O-乙酰基-4,6-O-亚乙基-α-
D-葡萄糖和1,3,6,2 / t',3 / t',4'制备2-甲基醚, 6'-庚-O-乙酰基-α-
麦芽糖。获得了Nmr光谱数据。