A range of the methyl glycosides of 2-deoxy-2-aminohexoses, comprising d-allosamine, d-mannosamine, d-idosamine and d-talosamine, were prepared from the corresponding d-aldopentoses via a seven step synthetic sequence. The doubly diastereoselective conjugate addition of the requisite antipode of lithium N-benzyl-N-(α-methylbenzyl)amide and in situ enolate oxidation with the requisite antipode of c
由相应的d-醛糖苷经七步合成序列制备了一系列的2-脱氧-2-
氨基己糖的甲基糖苷,其包含d - allosamine,d-
甘露糖胺,d-偶胺和d- talosamine 。N-苄基-N
锂的必要对映体的双非对映选择性共轭加成-(α-甲基苄基)酰胺和必要的
樟脑磺酰基恶二丙啶(CSO)对映体原位烯醇氧化被用作关键的立体定义步骤。依次还原生成的α-羟基-β-
氨基酯和C(1)–C(2)二醇单元的氧化裂解可提供相应的α-
氨基醛。随后的N和O脱保护得到目标化合物(作为端基异构体的混合物),收率高,非对映异构体纯度高。