Facile Synthesis of 5- to 7-Membered Benzolactam Compounds via Strongly Facilitated Electrophilic Aromtic Substitution Reaction†
作者:Tomohiko Ohwada、Hiroaki Kurouchi、Yuko Otani
DOI:10.3987/com-15-s(t)60
日期:——
We employed our system to activate aromatic ring-tethered carbamate compounds with trifluoromethanesulfonic acid to obtain benzolactams with 5- to 7-membered rings, and examined the substrate scope and limitations of this activation method. In 5-membered ring formation, a halogen group on the aromatic ring did not greatly affect the reaction yield, but other electron-donating groups inhibited the cyclization reaction, and various side-reactions occurred. In 7-membered ring formation, eletron-donating groups on aromatic ring promoted the cyclization reaction, but cyclization of electron-deficient aromatic rings did not proceed well. The 6-membered ring formation reaction showed the greatest substrate generality.