The reduction of α-keto amides derived from (2R,5R)-trans-2,5-bis(methoxymethoxymethyl)pyrrolidine with LiBEt3H or KBEt3H proceeded with high diastereoselectivity (up to 99% ds) to afford the corresponding α-hydroxy amides in good yield. The effect of added crown ethers or LiBr was also examined.
用 LiBEt3H 或 KBEt3H 还原 (2R,5R)-反式-2,5-双(甲氧基甲氧基甲基)
吡咯烷衍生的 α-酮酰胺时,具有很高的非对映选择性(高达 99% ds),可以得到相应的 α-羟基酰胺,收率很高。此外,还考察了添加
冠醚或 LiBr 的效果。