Palladium meditated CPhenyl–H bond activation of 2-furylimines versus tert-2-furylbenzylamines
摘要:
The reactions of 2-furylimines 2a-f and Na2PdCl4 in the presence of NaOAc at 8-10 degrees C result in nitrogen-palladium coordinated complexes 3a-f. Reduction of 2d-f with NaBH4 followed by N-methylation leads to the corresponding tert-2-furylbenzylamines 5a-c. Treatment of 5a-c with Na2PdCl4 at the same reaction condition as mentioned above affords palladacycles 6a-c where the Pd atoms connect to the phenyl ring rather than the furyl ring. The fact that 5a-c are more active than 2d-f in C-Phenyl-H bond activation implies that the electron density of C10 or C8 atom in former is higher than those in latter. Compounds 3a-f, 5a-c, 6a-c were identified by elemental analysis, IR and NMR. In addition, the structures of 3b, 3f and 6c were also confirmed by their single crystal X-ray diffractions. (C) 2014 Elsevier Ltd. All rights reserved.
Palladium meditated CPhenyl–H bond activation of 2-furylimines versus tert-2-furylbenzylamines
摘要:
The reactions of 2-furylimines 2a-f and Na2PdCl4 in the presence of NaOAc at 8-10 degrees C result in nitrogen-palladium coordinated complexes 3a-f. Reduction of 2d-f with NaBH4 followed by N-methylation leads to the corresponding tert-2-furylbenzylamines 5a-c. Treatment of 5a-c with Na2PdCl4 at the same reaction condition as mentioned above affords palladacycles 6a-c where the Pd atoms connect to the phenyl ring rather than the furyl ring. The fact that 5a-c are more active than 2d-f in C-Phenyl-H bond activation implies that the electron density of C10 or C8 atom in former is higher than those in latter. Compounds 3a-f, 5a-c, 6a-c were identified by elemental analysis, IR and NMR. In addition, the structures of 3b, 3f and 6c were also confirmed by their single crystal X-ray diffractions. (C) 2014 Elsevier Ltd. All rights reserved.