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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| Authors: | Molchanov A P Stepakov A V Boitsov V M Kopf J Kostikov R R |
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| Institution: | (1) St. Petersburg State University, Universitetskii pr. 2, St. Petersburg, 198904, Russia;(2) Institut für anorganische Chemie, Martin-Luter-King Platz 6, Hamburg, D-20146, Germany |
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| Abstract: | Substituted 6,8-dioxo-2,3,7-triazabicyclo3.3.0]oct-3-ene-4-carboxylates react with N-fluoropyridinium tetrafluoroborate to give mixtures of exo and endo isomers of 6-fluoro-2,4-dioxo-3-azabicyclo3.1.0]hexane-6-carboxylates. Analogous reaction of 6,8-dioxo-1,2,7-triazaspiro4.4]non-2-ene-3-carboxylates results in formation of syn,anti-isomeric 1-fluoro-4,6-dioxo-5-azaspiro2.4]heptane-1-carboxylates. |
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