Reactions of Heterocyclic Ketene Aminals with 2-[3-Oxoisobenzofuran-1(3H)-ylidene]malononitrile: Synthesis of Novel Polyfunctionalized 1,4-Dihydropyridine-Fused 1,3-Diazaheterocycles - Xu, Wen-Yuan; Jia, Yue-Mei; Yang, Jing-Kui; Huang, Zhi-Tang; Yu, Chu-Yi (Synlett, 2010)