A convenient, asymmetric synthesis of (R)-homopipecolic acid methyl ester and an homochiral peptide nucleic acid (PNA) monomer building block are described, starting from the orthogonally disubstituted (2E,7E)-nonadienedioate. The approach involves stereoselective Michael monoaddition of (R)-N-benzyl-N-α-methylbenzylamide to the unsaturated ester as the key step, and subsequent transformation of the remaining double bond of the unsaturated acid.
本文介绍了从正交二取代(2E,7E)-壬二烯酸酯开始,方便地不对称合成(R)-高哌
羧酸甲酯和同手性肽核酸 (
PNA) 单体结构单元的方法。该方法的关键步骤是将(R)-N-苄基-N-δ-±-甲基苄酰胺与不饱和酯进行立体选择性迈克尔单加成,然后再将不饱和酸的剩余双键进行转化。