Asymmetric Synthesis of 2,4,6-Trideoxy-4-(dimethylamino)-3-C-methyl-l-lyxohexopyranose (Lemonose)
作者:Géraldine Masson、Jieping Zhu、Guillaume Bernadat、Nicolas George、Cédric Couturier、Thierry Schlama
DOI:10.1055/s-0030-1259531
日期:2011.3
L-Lemonose, the glycosidic part of (–)-lemonomycin, has been synthesized in ten steps with 18% overall yield from Dthreonine. The key steps are a double, highly diastereoselective Grignard addition to a Weinreb amide and a chemoselective oxidation of a primary alcohol in the presence of a secondary alcohol, a tertiary alcohol and a tertiary amine, leading directly to the lactol.
L-柠檬糖是 (–)-柠檬霉素的糖苷部分,已分十步合成,Dthreonine 的总产率为 18%。关键步骤是对 Weinreb 酰胺进行双重、高度非对映选择性格氏加成,以及在仲醇、叔醇和叔胺存在下对伯醇进行化学选择性氧化,直接生成内酯。