[1] B. Groenendaal, E. Ruijter and R. V. A. Orru, “1-Azadienes in Cycloaddition and Multicomponent Reactions to- wards N-heterocycles,” Journal of Chemical Society, Chemical Communications, No. 43, 2008, pp. 5474-5489. doi:10.1039/b809206k
[2] M. Behforouz and M. Ahmadian, “Diels-Alder Reactions of 1-Azadienes,” Tetrahedron, Vol. 56, No. 30, 2000, pp. 5259-5288. doi:10.1016/S0040-4020(00)00259-3
[3] S. Jayakumar, M. P. S. Ishar and M. P. Mahajan, “Recent Advances in Synthetic Applications of Azadienes” Tet- rahedron, Vol. 58, No. 3, 2002, pp. 379-471. doi:10.1016/S0040-4020(01)01050-X
[4] T. N. Danks and D. Velo-Rego, “Reaction of a Chromium Carbene Complex with 1-Azadienes and Synthesis of Trisubstituted Pyrroles,” Tetrahedron Letters, Vol. 35, No. 50, 1994, pp. 9443-9444. doi:10.1016/S0040-4039(00)78565-0
[5] J. Barluenga, M. Tomas, J. A. Lopez-Pelegrin and E. Rubio, “Stereselective Cyclopropanation of 1-Azadienes with Fischer Carbine Complexes,” Journal of Chemical Society, Chemical Communications, No. 6, 1995, pp. 665- 666. doi:10.1039/c39950000665
[6] Y. N. Romaschin, M. T. H. Liu and R. J. Bonneau, “The Facile Synthesis of 1,2,3-Trisubstituted Pyrroles from the Reaction of Chlorocarbenes with 1-Azabuta-1,3-dienes,” Journal of Chemical Society, Chemical Communications, No. 5, 1999, pp. 447-448. doi:10.1039/a809508f
[7] M. Chagr, H. Fillion and A. Pougny, “A Regioselective Synthesis of 4,5- and 4,8-Disubstitutedazaanthraquinones by the Diels-Alder Route,” Tetrahedron Letters, Vol. 29, No. 46, 1988, pp. 5913-5916. doi:10.1016/S0040-4039(00)82224-8
[8] D. Berger and W. Imhof, “One-Pot Synthesis of γ-Lactams in a Reaction Cascade from α,β-Unsaturated Imines, CO and Ethylene Catalysed by Ru3(CO)12,” Journal of Chemical Society, Chemical Communications, No. 16, 1999, pp. 1457-1458. doi:10.1039/a903266e
[9] J. Barluenga, I. Merino and S. Palacios, “One Pot Synthesis of 2-Vinyl-1-azadienes and Divinylketones,” Tetrahe- dron Letters, Vol. 30, No. 40, 1989, pp. 5493-5496. doi:10.1016/S0040-4039(01)80602-X
[10] N. Martin, A. M. Grau, L. Sanchez, C. Seoane and M. Torres, “The First Hetero-Diels-Alder Reaction of 60?C with 1-Azadienes. Synthesis of Tetrahydropyrido [2’,3’: 1,2][60]fullerene Derivatives,” Journal of Organic Chemistry, Vol. 63, No. 22, 1998, pp. 8074-8076.
[11] C. R. Berry and R. P. Hsung, “In-verse Electron-Demand Aza-[4 + 2] Cycloaddition Reactions of Allenamides,” Tet- rahedron, Vol. 60, No. 35, 2004, pp. 7629-7636. doi:10.1016/j.tet.2004.05.117
[12] R. C. Clark, S. Pfeiffer and D. L. Boger, “Diastereoselective Diels-Alder Reactions of N-Sulfonyl- 1-aza-1,3-butadienes with Optically Active Enol Ethers: An Asym-metric Variant of the 1-Azadiene Diels-Alder Reaction,” Journal of American Chemical Society, Vol. 128, No, 8, 2006, pp. 2587-2593. doi:10.1021/ja0571646
[13] M. He, R. Struble and J. W. Bode, “Highly Enantioselective Azadiene Diels-Alder Reactions Catalyzed by Chiral N-Heterocyclic Carbenes,” Journal of American Chemical Society, Vol. 128, No. 26, 2006, pp. 8418-8420. doi:10.1021/ja062707c
[14] A. Robin, K. Julienne, J. C. Meslin and D. Deniaud, “Syn- thesis of Pyridone and Pyridine Rings by [4 + 2] Hetero-Cyclocondensation,” Tetrahedron Letters, Vol. 45, No. 52, 2004, pp. 9557-9559. doi:10.1016/j.tetlet.2004.10.142
[15] M. C. Elliott, E. Kruiswijk and D. J. Willock, “Asymmetric Hetero-Diels-Alder Reactions. Reactions of Oxazolo [3,2-c]pyrimidines,” Tetrahedron, Vol. 57, No. 51, 2001, pp. 10139-10146. doi:10.1016/S0040-4020(01)01032-8
[16] D. L. Boger, “Diels-Alder Reactions of Azdienes,” Tet- rahedron, Vol. 39, No. 18, 1983, pp. 2869-2939. doi:10.1016/S0040-4020(01)92154-4
[17] D. L. Boger and S. M. Weinreb, “In Hetero Diels-Alder Methodology in Organic Synthesis,” Academic Press Inc., San Diego, 1987, p 239.
[18] S. N. Mazumdar, M. Sharma and M. P. Mahajan, “Diels- Alder Cycloaddition Reactions of 1,3-Diazabutadienes with Sulfene,” Tetrahedron Letters, Vol. 28, No. 23, 1987, pp. 2641-2642. doi:10.1016/S0040-4039(00)96169-0
[19] P. Singh, G. Bhargava and M. P. Mahajan, “Tandem [2 + 2] Cycloaddition and Cope Rearrangement in Reactions of Cross-Conjugated Azatrienes with Conjugated Ketenes: A Facile Single Step Synthesis of Novel Azocinone Derivatives,” Tetrahedron, Vol. 62, No. 48, 2006, pp. 11267- 11273. doi:10.1016/j.tet.2006.09.007
[20] M. H. Elnagdi, S. M. Mousawi, M. M. Abdel-Khalik, S. El-Sheriny and E. John, “Studies with Enaminones: Reactivity of 1,5-Disubstituted-1,4-pentadien-3-ones toward Electrophilic Reagents. A Novel Route to Azolylazines, Benzofuranals, Pyranones,” Journal of Heterocyclic Chemistry, Vol. 38, No. 4, 2001, pp. 949-953. doi:10.1002/jhet.5570380422