Enantioselective Friedel-Crafts Alkylation of Thiophenes with Ethyl Glyoxylate: Easy Access to Chiral Secondary Alcohols
作者:Zhong Huang、Jingchang Zhang、Yuqiang Zhou、Nai-Xing Wang
DOI:10.1002/ejoc.201001455
日期:2011.2
Friedel–Crafts alkylation reactions of ethyl glyoxylate with various thiophenes to give the corresponding chiral secondary alcohols were demonstrated. The majority of these reactions proceeded with good enantioselectivities (up to 91 %) and satisfactory isolated yields. Notably, we found that 2-substituted thiophenes underwent the reaction more smoothly than unsubstituted and 3-substituted thiophenes
乙醛酸乙酯与各种噻吩的 Friedel-Crafts 烷基化反应得到了相应的手性仲醇。大多数这些反应以良好的对映选择性(高达 91%)和令人满意的分离产率进行。值得注意的是,我们发现 2-取代的噻吩比未取代和 3-取代的噻吩反应更顺利。