Abstract Treatment of O-(3,4,6- tri -O- acetyl -2-O- benzyl -α- d - glucopyranosyl )-(1 → 2)-3,4,6- tri -O- acetyl -α- d - glucopyranosyl trichloroacetimidate with BF3 - Et2O gave a high yield of the peracetate of cyclobis -(1 → 2)-α- d - glucopyranosyl (6). Compound 6 crystallizes in the space group P21 [a = 6.888(2), b = 24.771(5), c = 9.105(2) A , β = 111.49(2)°, Z = 2] and shows a high degree of
O-(3,4,6-三-O-乙酰基-2-O-苄基-α-d-
吡喃
葡萄糖基)-(1→2)-3,4,6-三-O-乙酰基-α的处理-d-具有BF 3 -Et 2 O的
吡喃
葡萄糖基三
氯乙酰亚
氨酸酯得到高产率的环双-(1→2)-α-d-
吡喃
葡萄糖基(6)的过
乙酸盐。化合物6在空间群P21中结晶[a = 6.888(2),b = 24.771(5),c = 9.105(2)A,β= 111.49(2)°,Z = 2],并显示出高度对称性。在图6中,两个α-d-
吡喃
葡萄糖基残基处于稍微扭曲的椅子构象中。
葡萄糖部分通过呈船形的1,4-
二恶烷部分相互连接,在端部位置具有异头碳原子。