Efficient Routes to Pyrazolo[3,4-b]indoles and Pyrazolo[1,5-a]benzimidazoles via Palladium- and Copper-Catalyzed Intramolecular C−C and C−N Bond Formation
摘要:
Efficient synthetic routes to pyrazolo[3,4-b]indoles and pyrazolo[1,5-a]benzimidazoles via intramolecular palladium- and copper-catalyzed cyclization of 1-aryl/1-unsubstituted 5-(2-bromoanilino)-pyrazole precursors via intramolecular C-C and C-N bond formation have been reported.
An expeditious FeCl<sub>3</sub>-catalyzed cascade 1,4-conjugate addition/annulation/1,5-H shift sequence for modular access of all-pyrano-moiety-substituted chromenes
An operationally simple protocol is described for the facile, modular and regioselective access of all-pyrano-moiety-substituted iminochromenes, particularly under undried acetonitrile and air atmosphere.