DBU assisted expeditious synthesis of glycosyl dienes via glycosylated β-hydroxy esters
作者:Shyam S. Verma、Namrata Dwivedi、Biswajit K. Singh、Rama P. Tripathi
DOI:10.1016/j.carres.2006.04.021
日期:2006.8
corresponding 3-O-benzyl(methyl)-6-carbethoxy-5,6-dideoxy-1,2-O-isopropylidene-7-phenyl-beta-L- threo-hept-4-enofuranoses. The latter on treatment with methanesulfonyl chloride followed by DBU catalyzed E2 reaction of the methanesulfonyloxy intermediates gave the respective 3-O-benzyl(methyl)-6-carbethoxy-5,6,7-trideoxy-1,2-O-isopropylidene-7-phenyl-beta -L-threo-hept-4,6-dienofuranose in moderate to
DBU催化3-O-苄基(甲基)-5,6-二脱氧-1,2-O-异亚丙基-β-L-苏-庚-4-呋喃呋喃酮酸酯与不同醛的缩合反应生成相应的3-O-苄基(甲基)-6-乙氧基-5,6-二脱氧-1,2-O-异亚丙基-7-苯基-β-L-苏庚庚-4-烯呋喃糖酶。后者经甲磺酰氯处理,然后经DBU催化的甲磺酰氧基中间体的E2反应,得到相应的3-O-苄基(甲基)-6-乙氧基-5,6,7-三苯氧基-1,2-O-异亚丙基-7 -苯基-β-L-苏庚-4,6-二呋喃糖,产率中等至良好。