Tocopherol side chain synthesis via asymmetric organocatalytic transfer hydrogenation and convenient measurement of stereoselectivity
作者:Hyunji Lee、You-Kyoung Lee、Dong-Guk Kim、Mi-Sun Son、Tae-gyu Nam、Byeong-Seon Jeong
DOI:10.1016/j.tetlet.2014.08.085
日期:2014.10
An asymmetric synthetic route for 1-iodofarnesane, a key intermediate for tocopherol side chain synthesis, starting from (+)-(R)-citronellal was developed. 1-Iodofarnesane was prepared through eight steps in about 50% overall yield, and asymmetric transfer hydrogenation of the enal with a chiral organocatalyst was conducted as a stereoinduction step. To measure the stereoinduction level and optical
从(+)-(R)-香茅醛开始,开发了1-碘法呢烷(生育酚侧链合成的关键中间体)的不对称合成路线。通过八步制备1-碘法呢烷,总收率约为50%,作为立体诱导步骤,用手性有机催化剂进行烯醛的不对称转移氢化。为了测量产物的立体诱导水平和光学纯度,开发了一种方便的分析方法,其中发现C 15醇的苯基氨基甲酸酯衍生物适合于为手性UV-HPLC分析提供适当的极性和UV活性。