18. Direct Metalation of Heteroaromatic Esters and Nitriles Using a Mixed Lithium-Cadmium Base. Subsequent Conversion to Dipyridopyrimidinones.

https://doi.org/10.1021/jo902385h

G. Bentabed-Ababsa, S. Cheikh Sid Ely, S. Hesse, E. Nassar, F. Chevallier, T. T. Nguyen, A. Derdour, F. Mongin, J. Org. Chem. 2010, 75, 839-847.