A study of enantioselective syntheses by Sharpless asymmetric oxidation for aryl sulfoxides containing oxygen groups at the ortho position
作者:Takanori Takei、Jun Takayama、Meiyan Xuan、Misa Tomoda、Hiroshi Miyamae、Takeshi Sakamoto
DOI:10.1007/s12039-021-01887-5
日期:2021.3
enantioselectivity of the products. Also, several chiral ligands for Sharpless asymmetric oxidation reaction were evaluated to improve the enantioselectivity. Graphic abstract High enantioselectivity of ortho-alkoxy aryl chiral sulfoxides have been achieved by Sharpless oxidation reaction using Ti(O-i-Pr)4 and diethyl tartrate under anhydrous condition. In particular, the enantioselctivity of products was influenced
摘要 通过Sharpless不对称氧化反应合成了具有各种取代基的邻烷氧基芳基亚砜,我们优化了反应条件,筛选出更好的起始原料组合,获得了较高的对映选择性。该结果表明新的信息,即芳环上的吸电子取代基对产物的对映选择性有很大影响。此外,评估了几种用于Sharpless不对称氧化反应的手性配体,以提高对映选择性。 图形摘要 在无水条件下,使用Ti(Oi - Pr)4和酒石酸二乙酯通过Sharpless氧化反应,可以实现对烷氧基芳基手性亚砜的高对映选择性。特别地,产物的对映体选择性受芳环上的吸电子取代基如硝基,酯和醛基的影响。