Synthesis of Medium-Ring-Sized Benzolactams by Using Strong Electrophiles and Quantitative Evaluation of Ring-Size Dependency of the Cyclization Reaction Rate
作者:Hiroaki Kurouchi、Tomohiko Ohwada
DOI:10.1021/acs.joc.9b02843
日期:2020.1.17
dilution. These reactions were utilized to quantitatively examine the extent of retardation of medium-sized ring formation, compared to five- or six-membered ring formation. The order of reaction rates of formation of cyclic benzolactams is six- > five- > seven- > eight- > nine-membered ring at 25 °C. The present reaction provides a route to eight- and nine-membered benzolactams.
通过氨基甲酰基阳离子(R1R2N +═C═O)的亲电芳族取代反应,无需稀释即可良好地获得高收率的苯甲酰胺。与五元或六元环形成相比,这些反应用于定量检测中型环形成的延迟程度。在25°C时,形成环苯并内酰胺的反应速率的顺序为六->五->七->八->九元环。本反应提供了八元和九元苯并内酰胺的途径。