Efficient approach to allylated quinolines via palladium-catalyzed cyclization–allylation of 1-azido-2-(2-propynyl) benzenes with allyl methyl carbonate
The palladium-catalyzed cyclization-allylation reaction of ortho-azido propynylbenzenes 1 and ally' methyl carbonate 2d gives the corresponding allylated quinolines in moderate to good yields. The reaction of 1-azido-2-(2-propynyl)benzene la proceeds smoothly with 10 mol % Pd(PPh3)(4) and 5 equiv K3PO4 or NaOAc in DMF at 100 degrees C to afford 3,4-diallylquinoline 3a in 69% yield in the case of R-2 = H and 3-allylquinoline 4 in 67% yield in the case of R-2 not equal H. (C) 2014 Elsevier Ltd. All rights reserved.
Synthesis of allylated quinolines/isoquinolines via palladium-catalyzed cyclization–allylation of azides and allyl methyl carbonate
A novel and efficient strategy for one-step synthesis of allylated quinolines and isoquinolines via palladium-catalyzed cyclization-allylation of azides and allyl methyl carbonate is developed for the first time. The results indicated that the regioselective synthesis of allyl- and diallyl-substituted quinolines/isoquinolines depends on different substituted groups at R(1) and R(4) positions, such