Synthesis of Fusion-Isomeric Imidazopyridines and Their Evaluation as Inhibitors ofsyn- andanti-Protonating Glycosidases
作者:Narinder Mohal、Andrea Vasella
DOI:10.1002/hlca.200490287
日期:2005.1
The galacto- and gluco-configured imidazopyridines 4 and 5 were synthesised as potential inhibitors of syn-protonating β-glycosidases. Methyl α-D-lyxopyranoside (9) was transformed into the 3,4-anhydro-β-L-riboside 16, which, upon treatment with Et2AlCN, gave the nitrile 17 (76–85%). Reaction of 17 with the dimethyl aluminate of aminoacetaldehyde dimethyl acetal led directly to the branched chain lyxo-configured
的半乳糖-和葡萄糖-配置咪唑并吡啶4和5合成为的潜在抑制剂的合成-protonating β -glycosidases。甲基α -D-吡喃吡喃糖苷(9)转化为3,4-脱水-β -L-核糖苷16,经Et 2 AlCN处理后得到腈17(76-85%)。17与氨基乙醛二甲基乙缩醛的铝酸二甲酯反应直接导致支链lyxo构型的咪唑27(53%),将其水解成的平衡混合物4和28 - 30。的可氧化还原27提供的阿拉伯-型咪唑42(约48%来自27)。的水解42导致了混合物5 / 45(63-90%)。抗-Protonating β -galactosidases和β葡糖苷酶(家庭1和2)仅微弱地抑制由4 / 28 - 30和5 / 45分别。还有顺-protonating纤维素酶(Cel7A纤维)中的溶液通过弱的单糖模拟物抑制5 / 45,表明要么单糖模拟物太小抑制Cel7A纤维,或同分异构体融合四氢咪唑并[1