Synthesis of Enantiopureo-Hydroxybenzylamines by Stereoselective Reduction of 2-Imidoylphenols: Application in the Catalytic Enantioselective Addition of Diethylzinc to Aldehydes
作者:Gianni Palmieri
DOI:10.1002/(sici)1099-0690(199904)1999:4<805::aid-ejoc805>3.0.co;2-r
日期:1999.4
o-hydroxybenzylamines 2a–i were synthesized by diastereoselective reduction of the 2-imidoylphenols (R)-1a–i. Conformational analysis enabled the assignment of the absolute configurations of compounds 2a–i. The accessible o-hydroxybenzylamine (R,R)-2h serves as an effective catalyst precursor for highly enantioselective addition of diethylzinc to aliphatic and aromatic aldehydes. This pathway represents a practical
对映体纯邻羟基苄胺 2a-i 是通过非对映选择性还原 2-亚氨基苯酚 (R)-1a-i 合成的。构象分析能够确定化合物 2a-i 的绝对构型。可接近的邻羟基苄胺 (R,R)-2h 作为一种有效的催化剂前体,用于二乙基锌与脂肪族和芳香族醛的高度对映选择性加成。该途径代表了一种实用且操作上非常简单的方法,用于对映选择性合成仲醇 7a-f 的两种对映异构体。