6-lactam ( 2 ), a novel d -glucorono-6,1-lactam derivative. Its conformation in solution, examined by 1 H- and 13 C-n.m.r. and compared with the crystal structure, corresponds to a fairly rigid ring system, the pyranose ring adopting a near B O,3 ( d ) boat form in solution and a distorted 1 C 4 ( d ) chair conformation in the crystalline state. The closely related 2,3,4-tri- O -acetyl-β- d -glucopyranurono-6
摘要在
吡啶存在下,于室温下用
乙酸酐将2'-(β-d-
葡萄糖基
吡喃
葡萄糖基
尿酸酯
钠)异烟酰
肼在室温下延长处理约110小时,得到2,3,4-三-O-乙酰基-N-(
二乙酰氨基)- β-d-
葡萄糖吡喃并-1,6-内酰胺(2),一种新的d-
葡萄糖基-6,1-内酰胺衍
生物。由1 H-和13 Cn.mr检查并在溶液中的构象,并与晶体结构进行比较,它对应于一个相当刚性的环系统,
吡喃糖环在溶液中采用接近BO,3(d)的船形,并扭曲了1 C 4(d)椅构型呈结晶态。密切相关的2,3,4-tri-O-乙酰基-β-d-
吡喃
葡萄糖醛-6,1-内酯(4)和2,3,4-tri-O-乙酰基-1,6-脱
水-β- d-
葡萄糖(3)呈扭曲的1 C 4(d)构象,呈溶液形式和晶体形式。根据4的晶体结构数据,