Product selectivity of thermal Buchner reaction of methyl 2-(3-arylisoxazol-5-yl)-2-diazoacetates with benzene, naphthalene and mesitylene, and ring-opening/closing reaction of products
作者:Anna V. Serebryannikova、Ekaterina E. Galenko、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1016/j.tet.2021.132153
日期:2021.5
norcaradiene adducts. In contrast, their thermal reaction with mesitylene gave only the products of carbene insertion into C–H bond of mesitylene. According to DFT calculations, such a difference in the product selectivity of the thermal Buchner reaction of the diazoacetates with benzene, naphthalene and mesitylene is associated with the fact that the first two reactions proceed under kinetic control, and
合成了2-(3-芳基异恶唑-5-基)-2-重氮乙酸甲酯,并研究了其热布氏反应与苯,萘和均三甲苯的产物选择性。异恶唑基取代的重氮乙酸酯与苯的反应产生了处于快速平衡的环庚三烯/降冰片烯异构体加合物的混合物。将相同的重氮化合物与萘一起加热仅能生成稳定的降丁卡汀加合物。相反,它们与均三甲苯的热反应仅使卡宾插入到均三甲苯的C–H键中。根据DFT计算,重氮乙酸酯与苯,萘和均三甲苯的热布氏反应产物选择性的这种差异与以下事实有关:前两个反应是在动力学控制下进行的,最后一个在热力学控制下。合成的异恶唑被转化为一个新的功能化烯胺酮家族,(Z)-甲基5-氨基-2,5-二芳基-3-氧代-2-苯基戊-4-烯酸酯,通过与Mo(CO)6 / H 2 O氢化试剂反应,其中Mo(CO)6也催化起始化合物的正二十碳烯基的逆布氏反应。所获得的烯胺酮是方便的3,6-二芳基-4-羟基-3-苯基吡啶-2-2(1 H)-的前体,由它们在热条件下以高收率制备。