Synthesis and anomeric configuration of 2-(erythrofuranosyl)benzimidazole C-nucleoside analogues
作者:Mohammed A.E. Sallam、El-sayed I. Ibrahim、Khaled A.A. El-Eter、John M. Cassady
DOI:10.1016/s0008-6215(96)00296-0
日期:1997.2
ole C-nucleoside analogues 2 and 3 , were prepared from the corresponding epimeric 2-( d - arabino , and d - ribo -tetritol-1-yl)benzimidazole analogues 1 and 4 , respectively. Similarly, 2-(β- l -erythrofuranosyl)benzimidazole 13 was obtained from the precursor 2-( l - arabino -tetritol-1-yl)benzimidazole 12 . The structure and anomeric configuration of the C-nucleoside analogues 2 , 3 , and 13 were
摘要从相应的差向异构体2-(d-阿拉伯糖和d-核糖-四糖醇-1-基)苯并咪唑类似物1制备了2-(α-和β-d-赤呋喃呋喃糖基)苯并咪唑C-核苷类似物2和3。和4。类似地,从前体2-(1-阿拉伯糖-四糖醇-1-基)苯并咪唑12获得了2-(β-1-异呋喃呋喃糖基)苯并咪唑13。C-核苷类似物2、3和13的结构和端基异构构型通过酰化,1 H和13 C NMR光谱法和质谱法确定。
A heterogeneous Pd–Bi/C catalyst in the synthesis of l-lyxose and l-ribose from naturally occurring d-sugars
作者:Ao Fan、Stephan Jaenicke、Gaik-Khuan Chuah
DOI:10.1039/c1ob06116j
日期:——
A critical step in the synthesis of the rare sugars, L-lyxose and L-ribose, from the corresponding D-sugars is the oxidation to the lactone. Instead of conventional oxidizing agents like bromine or pyridinium dichromate, it was found that a heterogeneous catalyst, Pd–Bi/C, could be used for the direct oxidation with molecular oxygen. The composition of the catalyst was optimized and the best results