Atom economy. Palladium-catalyzed formation of coumarins by addition of phenols and alkynoates via a net CH insertion

~74%

~%

~%

~%

~%

~%

~%

~%

~%

~46%

~39%

~60%

~75%

~%

~%

~%

~%

~%

~%

~%

~31%

~0%

~%