The nitrile oxide–isoxazoline approach to 11-carbon monosaccharides. Conversion of 3-(tetritol-1-yl)-5-(tetrofuranos-4-yl)-2-isoxazolines into 6-deoxyundecoses
作者:Karen E. McGhie、R.Michael Paton
DOI:10.1016/s0008-6215(99)00168-8
日期:1999.9
analysis of their 5,7- O -isopropylidene derivatives. 6-Deoxy- l - manno - d - gluco - and l - gluco - d - gluco -undecose analogues 19 and 20 were prepared similarly from the isomeric 3-( l - arabino -tetritolyl)-4,5-dihydroisoxazole. Removal of the isopropylidene protecting groups from compounds 17 and 20 yielded 3- O -benzyl-6-deoxy- d - gluco - and l - manno - d - gluco -undecopyranoses, which
(5 R)-3-(1,2:3,4-二-O-异亚丙基-d-阿拉伯糖-四醇-1-基)-5-(3-O-苄基-1,2-O -异亚丙基-α-d-二甲苯基-呋喃并呋喃-4-基)-4,5-二氢异恶唑制得7-ulose衍生物,从该衍生物中可得到6-脱氧-d-葡萄糖-d-葡萄糖-和d-甘露糖-d-葡萄糖通过用硼氢化钠或1-Selectride还原来制备十一糖衍生物17和18。通过化合物5,7-O-异亚丙基衍生物的NMR分析,确定化合物17和18中新的立体异构中心(C-7)的构型。类似地由异构体3-(1-阿拉伯-四糖醇基)-4,5-二氢异恶唑制备6-脱氧-1-甘露聚糖-d-葡萄糖和1-葡萄糖-d-葡萄糖-十一碳糖类似物19和20。从化合物17和20中除去异亚丙基保护基,得到3-O-苄基-6-脱氧-d-葡萄糖-和1-manno-d-葡萄糖-非复制果糖,其特征在于它们是八乙酸酯衍生物。3-(d-和l-阿拉伯糖-四糖醇-1-基)-5-(2