A simple approach to the synthesis of muramic acid and isomuramic acid: 1H and 13C NMR characterisation
作者:Valentine Ragoussis、Leondios Leondiadis、Evangelia Livaniou、Gregory P. Evangelatos
DOI:10.1016/s0008-6215(96)00271-6
日期:1997.1
afforded crystalline methyl 2-acetamido-4,6- O -benzylidene-3- O -[( R,S )-1-carboxyethyl]-2-deoxy-α- d -glucopyranoside ( 2 ), in 72% yield, as a mixture of diastereomers. Esterification of 2 with an excess of diazomethane afforded quantitatively the corresponding mixture of epimeric esters, which were very easily separated by column chromatography on silica gel, giving pure ( R ) and ( S ) epimeric esters
摘要一种简单高效的2-氨基-3-O-[(R)-1-羧乙基] -2-脱氧-d-葡萄糖(山梨酸,6)及其立体异构体2-氨基-3-O- [的合成方法描述了由甲基2-乙酰氨基-4,6-O-亚苄基-2-脱氧-α-d-吡喃葡萄糖苷(1)制成的(S)-1-羧乙基] -2-脱氧-d-葡萄糖(异iso酸,7)(1) 。将1的O-3氧阴离子与过量的(R,S)-2-溴丙酸甲酯缩合,然后将粗产物进行碱水解并随后酸化,得到结晶的甲基2-乙酰氨基-4,6-O-苄基甲基-3-O-[(R,S)-1-羧乙基] -2-脱氧-α-d-吡喃葡萄糖苷(2),为非对映异构体的混合物,产率为72%。用过量的重氮甲烷将2酯化,可定量得到相应的差向异构体酯混合物,该混合物很容易通过硅胶柱色谱分离,得到纯的(R)和(S)差向异构体酯。通过酸水解除去亚苄基和乙酰基,分别以95%的收率得到了山mic酸(6)和以93%的收率得到了异村二酸(7)。给出了1