(untitled) - Zidan, A; Garrec, J; Cordier El Naggar, M A. M; El-Sattar, N E. A; Ali, A K; Hassan, M A; El Kaïm, L (Angew. Chem. Int. Ed., 2017)
The starting malonic amide was prepared by a selective amidification of the diester followed by saponification, see: