The reaction of 1-aroyl-2-aryl-3a,6a-diazapentalenes with dimethyl acetylenedicarboxylate affords, in an unusual fashion, stable anti-Bredt compounds possessing a 4,10-diazabicyclo[5.2.1]deca-1,3,5,8-tetraene skeleton, the structure of which is confirmed by X-ray crystal structure analysis as well as by 1H and 13C NMR spectroscopy.
K. Matsumoto, H. Iida, H. Katsura, T. Machiguchi, H. Uekusa and Y. Ohashi, J. Chem. Soc., Perkin Trans. 1, 1996, 2333 DOI: 10.1039/P19960002333
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