Cycloaddition of sulfonyl azides and cyanogen azide to enamines. Quantum-chemical calculations concerning the spontaneous rearrangement of the adduct into ring-contracted amidines
Gerard Audran, Chiaa Adiche, Paul Bremond, Douniazad El Abed, Mohammed Hamadouche, Didier Siri, Maurice Santelli
Tetrahedron Letters, 58 945–948 (2017)