The periselective DielsâAlder reaction of 5-substituted pentamethylcyclopentadienes and nitroethylene has been realized by helicalâchiral hydrogen bond donor catalysts. To our knowledge, this represents the first asymmetric catalytic nitroalkene DielsâAlder reaction via activation of nitroalkene, and thus establishes its proof-of-principle.
通过螺旋手性氢键供体催化剂,实现了5-取代五
甲基环戊二烯与
硝基乙烯的区域选择性狄尔斯-阿尔德反应。据我们所知,这代表了通过硝基烯的活化实现的第一个不对称催化硝基烯狄尔斯-阿尔德反应,从而确立了其原理验证。