Diastereoselective hydrogenation of α,β-unsaturated but-2-enamides to access the chiral 3-(p-tolyl) butanoic acids
作者:Jacqueline Jiménez、Mildred López、Vladimir Carranza、Angel Mendoza、Jenaro Varela、Estibaliz Sansinenea、Aurelio Ortiz
DOI:10.1016/j.tetlet.2016.12.017
日期:2017.1
An alternative methodology for the synthesis of chiral 3-(p-tolyl) butanoic acids is presented. This was accomplished through the diastereoselective hydrogenation reaction of different chiral N-3-(p-tolyl) but-2-enamides, using Pd/C in EtOH, to produce the corresponding chiral N-3-(p-tolyl) butanamides with high chemical yields and moderate diastereomeric ratios. Removal of the chiral auxiliary from
提出了合成手性3-(对甲苯基)丁酸的另一种方法。这是通过在EtOH中使用Pd / C对不同的手性N -3-(对甲苯基)丁-2-烯酰胺进行非对映选择性氢化反应来生产相应的手性N -3-(对甲苯基)丁酰胺而得到的化学收率和适度的非对映异构体比率。从N -3-(对甲苯基)丁酰胺中除去手性助剂,得到相应的对映体纯酸。