Journal
TETRAHEDRON
Volume 66, Issue 48, Pages 9356-9362Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2010.10.013
Keywords
Cyclization; Benzodiazepines; Nitrile imines; Stilbenes; Sydnones; Quinolines
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Funding
- Ministry of Science, Education and Sports of the Republic of Croatia [125-0982933-2926, 098-0982929-2917]
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Stilbeneylsydnone derivatives were synthesized by a sequence of reactions in good yields. Irradiation of 3-stilbeneyl-4-methylsydnone 4 gives 1H-1,2-benzodiazepine derivative 7 as the main product along with 2-methylquinoline derivative 20. Irradiation of 3-stilbeneyl-4-phenylsydnone 5 afforded only 1H-1,2-benzodiazepine derivative 8 whereas on irradiation of 4-unsubstituted 3-stilbeneylsydnone 3 no benzodiazepine derivative was detected. An efficient novel photochemical approach to 1H-1,2-benzo-diazepines has been found from the new 3-(o-stilbeneyl)-4-substituted-sydnones via intramolecular 1,7-electrocyclization reaction of the photogenerated nitrile imines. (C) 2010 Elsevier Ltd. All rights reserved.
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