An efficient transition metal-free approach for the regio- and stereoselective addition of imidazoles 1a–f onto alkynes 2a–l to provide the Z- and E isomers of imidazolyl enamines 3a–q and 4a–d using catalytic amount of KOH is described. Stereoselectivity of the addition products (Z and E isomer) was found to be dependent upon time. Competitive experiments show that imidazole is less reactive than
描述了一种有效的无过渡
金属的方法,该方法用于将
咪唑1a – f区域和立体选择性地加成到
炔烃2a – l上,以使用催化量的KOH提供
咪唑基烯胺3a – q和4a – d的Z和E异构体。发现加成产物(Z和E异构体)的立体选择性取决于时间。竞争性实验表明,
咪唑对
吡咯胺的反应性低于
吡咯,而比
苯胺的反应性更高。