Reaction of Substituted 6,8-Dioxo-2,3,7-triazabicyclo[3.3.0]oct-3-ene-4-carboxylates and 6,8-Dioxo-1,2,7-triazaspiro[4.4]non-2-ene-3-carboxylates with N-Fluoropyridinium Tetrafluoroborate

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