Some non-anomerically CC-linked carbohydrate amino acids related to leucine—synthesis and structure determination
作者:Bohumil Steiner、Júlia Mičová、Miroslav Koóš、Vratislav Langer、Dalma Gyepesová
DOI:10.1016/s0008-6215(03)00176-9
日期:2003.6
(5'R)-5'-Isobutyl-5'-[methyl (4R)-2,3-O-isopropylidene-beta-L-erythrofuranosid-4-C-yl]-imidazolidin-2',4'-dione was synthesised starting from methyl 2,3-O-isopropylidene-alpha-D-lyxo-pentodialdo-1,4-furanoside via methyl 6-deoxy-6-isopropyl-2,3-O-isopropylidene-alpha-D-lyxo-hexofuranosid-5-ulose applying the Bucherer-Bergs reaction. Its 5'-R configuration was confirmed by X-ray crystallography. Corresponding
(5'R)-5'-异丁基-5'-[甲基(4R)-2,3-O-异亚丙基-β-L-赤呋喃呋喃糖基-4-C-基]-咪唑啉丁-2',4'-二酮由甲基2,3-O-异亚丙基-α-D-lyxo-pentodialdo-1,4-呋喃糖苷经甲基6-脱氧-6-异丙基-2,3-O-异亚丙基-α-D-lyxo-合成应用Bucherer-Bergs反应生成六呋喃糖苷5-ulose。X射线晶体学证实了其5'-R构型。相应的α-氨基酸-甲基(5R)-5-氨基-5-C-羧基-5,6-二脱氧-6-异丙基-α-D-lyxo-六呋喃糖苷(替代名称:2- [甲基(4R)-由上述乙内酰脲通过对异亚丙基的酸水解,然后将乙内酰脲环进行碱性水解,得到β-L-赤藓呋喃糖苷-4-C-基] -D-亮氨酸。还分离并鉴定了少数形成的具有5S构型的类似衍生物。