Reactions on phenyl chlorosulfate at OH-1, -4, and -6 of aldohexopyranose derivatives. Formation of 1,2-oxazoline and 4,6-cyclic sulfate rings
作者:Magdy M. Abdel-Malik、Arthur S. Perlin
DOI:10.1016/0008-6215(89)84091-1
日期:1989.6
little or no interference with disaccharide synthesis at the nearby O-4 atom. Conformations of both cis - and trans -fused types of 4,6-cyclic sulfates are discussed. At an unsubstituted anomeric center, the course of reaction by phenyl chlorosulfate is determined by neighboring-group participation possibilities, and the strong leaving-group affinity of a phenylsulfate substituent. This is demonstrated
摘要在苯基氯硫酸氢钠与不含OH-4和OH-6的化合物的反应中,例如在甲基2,3-二-O-苄基醛基吡喃吡喃糖苷中,伯羟基发生区域选择性取代,或者4,取决于实验条件,形成6-环硫酸盐。向二-O-苄基糖苷中添加6-(苯硫酸盐)取代基似乎几乎不干扰或几乎不干扰附近的O-4原子处的二糖合成。讨论了4,6-环硫酸盐的顺式和反式融合形式的构象。在未取代的异头异构中心,氯硫酸苯酯的反应过程取决于相邻基团的参与可能性以及苯硫酸酯取代基的强离去基团亲和力。2-乙酰氨基-4的60%转化证明了这一点,