Carbon-chain extension through C-1 of 2-deoxyaldose D1-thioacetal derivatives: A route to 1,3-dideoxy-2-ketoses
作者:Derek Horton、Robert A. Markovs
DOI:10.1016/0008-6215(80)90010-5
日期:1980.1
7-monodeacetonation could be achieved in high yield, affording access via glycol cleavage-reduction to the 1,3-dideoxy-2-hepulose derivative. Demercaptalation of 4 gave the acetal-protected 1,3-dideoxy-2-heptulose, which underwent methanolysis to give crystalline methyl, 1,3-dideoxy-α- d - arabino -heptulopyranoside. Anions of the type derived from 3 have broad, synthetic potential for access to chain-extended
摘要将2-脱氧-d-阿拉伯-己糖的3,4:5,6-二异亚丙基缩醛(3)在-30°C的环氧丙烷中用丁基锂提取H-1。碘甲烷容易与生成的阴离子反应,生成1,3-二脱氧-2-庚糖衍生物4,同样可以进行C-1苄基化。尝试将4脱乙酰化,得到的混合物虽然可以高收率实现6,7-单酰丙酮化,但可以通过乙二醇裂解还原获得1,3-二脱氧-2-庚糖衍生物。脱巯基化4得到缩醛保护的1,3-二脱氧-2-庚糖,对其进行甲醇分解,得到结晶的甲基1,3-二脱氧-α-d-阿拉伯-庚基吡喃糖苷。衍生自3的类型的阴离子具有广泛的合成潜力,可用于获得目标链扩展的2-酮糖衍生物作为代谢中间体,