Synthesis of N‐Fused Indolines via Copper (II)‐Catalyzed Dearomatizing Cyclization of Indoles

Herein, a copper(II)-catalyzed dearomative cyclization amination of N-(2-aminobenzoyl) indoles is presented. Under mild reaction conditions, the proceeds to afford tetracyclic indolines by forming new C−N bond in good yields. The 5a,6-dihydroindolo[2,1-b]quinazolin-12(5H)-ones are obtained excellent yields (up 99% yield) using trifluoromethanesulfonic acid (TfOH) mediated N−Ts cleavage. compounds could be easily functionalized simple synthetic methods.