Pd‐Assisted Cross‐Coupling Reactions with 4‐Chlorocinnoline

A series of 4‐ethynylcinnolines 3a – e was prepared by Sonogashira reaction of 4‐chlorocinnoline ( 1 ) with appropriate alkynes. Moreover, Suzuki coupling of 1 with boronic esters gave the corresponding 4‐arylcinnolines 5a – c . Detailed NMR spectroscopic data including unambiguous chemical shift assignments of all ¹H, ¹³C, and ¹⁵N resonances of the obtained cinnoline derivatives are reported.