Palladium-Catalyzed Coupling of Oxazol-2-yl and 2-Oxazolin-2-yltrimethylstannanes with Aromatic Halides. A New Entry to 2-Aryl and 2-Heteroaryl Oxazoles and Oxazolines
4-Methyloxazole and 4,4-dimethyl-2-oxazoline were treated with n-butyllithium and trimethyltin chloride to give the corresponding 2-trimethylstannyl derivatives which in the presence of tetrakis(triphenylphosphine)palladium(0) as a catalyst undergo cross-
MASKED MULTIFUNCTIONALIZATION OF AROMATICS BY PALLADIUM-CATALYZED HALOGEN-OXAZOLINE EXCHANGE
The (Ph3P)4Pd-catalyzed cross-coupling of aryl and heteroaryl halides with 2-(trimethylstannyl)-4,4-dimethyl-2-oxazoline 3 affords aromatic 2-oxazolines 6 in very high yields.