Asymmetric Hetero-Diels-Alder Reaction of Danishefsky’s Diene with α-Ketoesters and Isatins Catalyzed by a Chiral<i>N</i>,<i>N′</i>-Dioxide/Magnesium(II) Complex
作者:Jianfeng Zheng、Lili Lin、Kai Fu、Yulong Zhang、Xiaohua Liu、Xiaoming Feng
DOI:10.1002/chem.201404144
日期:2014.10.27
A highly enantioselective hetero‐Diels–Alder reaction of Danishefsky’s diene with α‐ketoesters and isatins has been realized by using a chiral N,N′‐dioxide/MgII complex. In the presence of only 0.1–0.5 mol % catalyst, a series of substrates were transformed into the corresponding tetrasubstituted 2,3‐dihydropyran‐4‐ones in up to 99 % yield and more than 99 % ee in two hours.
丹尼谢夫斯基双烯与α酮酯和靛红的高度对映选择性的杂Diels-Alder反应已经通过使用手性实现Ñ,Ñ '二氧化物/镁II复合物。在仅0.1-0.5 mol%的催化剂存在下,一系列的底物在两个小时内转化成相应的四取代的2,3-二氢吡喃-4-酮,产率高达99%,ee大于99% 。