38% yield, together with 19% of unreacted material. 1,5-Anhydro-3,6-di-O-benzoyl-2-deoxy- d -arabino-hex-1-enitol (7) was prepared from 1,5-anhydro-2-deoxy- d -arabino-hex-1-enitol by selective benzoylation, from which the corresponding 4-methanesulfonate 8 was obtained. Treatment of 8 with sodium benzoate in hexamethylphosphoric triamide for 72 h at 100° afforded 1,5-anhydro-3,4,6-tri-O-benzoyl-2-deoxy-
摘要将1,5-脱
水-3,4,6-三-O-苯甲酰基-2-脱氧-d-
阿拉伯糖基己糖-1-烯醇(1)与
甲醇和AG 50W-X8阳离子交换
树脂回流煮沸。获得了糖苷(2和3)的两种产物混合物,产率为38%,未反应的物质为19%。1,5-脱
水-3,6-二-O-苯甲酰基-2-脱氧-d-
阿拉伯糖基己糖-1-烯醇(7)由1,5-脱
水-2-脱氧-d-
阿拉伯糖基己糖制备通过选择性苯甲酰化-1-烯醇,从中获得相应的4-
甲磺酸酯8。在六甲基
磷酸三酰胺中于100°下用
苯甲酸钠处理72小时,得到1,5-脱
水-3,4,6-三-O-苯甲酰基-2-脱氧-d-羟己基-1-烯醇(9)收率达52%。还分离出未知的副产物(B),其暂时显示为三-O-苯甲酰基-d-hex-2-烯
吡喃
糖类似物,产率为14%。根据B的J1,3分析了270
MHz的nmr光谱,J2,4和J4,5偶合常数与
十六烷基-2-烯
吡喃糖的各种构型和构象可能性有关,被确定为1