independent routes to the formal synthesis of (–)-epiquinamide, have been described: the first route utilizes an l -proline-catalyzed one-pot sequential α-amination/propargylation of aldehyde, while the second one employs asymmetric dihydroxylation as the key reaction to install the stereochemistry. While the first synthesis was accomplished in nine steps with 24.4% overall yield and dr 9:1, the second strategy
已经描述了正式合成 (-)-表喹酰胺的两种独立途径:第一种途径利用 l-脯
氨酸催化的单锅顺序 α-
氨基化/炔丙酰化醛,而第二种途径采用不对称二羟基化作为关键反应安装立体
化学。虽然第一个合成分九步完成,总产率为 24.4%,dr 为 9:1,但第二个策略导致分八步合成,总产率为 36.4%,并具有完美的对映体控制。