Synthesis p. 1048 - 1053 (1990)
Update date:2022-08-05
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1-Isocyanato-1-(phenylazo)heterocycloalkanes 3a-f react with tetrafluoroboric acid to yield the respective 3-spiro-substituted 4,5-dihydro-5-oxo-1-phenyl-3H-1,2,4-triazolium tetrafluoroborates 4a-f. These compounds rearrange under ring enlargement in good yields to 1,5-heteroannulated 1,2-dihydro-2-phenyl-3H-1,2,4-triazol-3-ones 5a-f. In two special cases, 4,5-heteroannulated 2,4-dihydro-2-phenyl-3H-1,2,4-triazol-3-ones 7g,h are obtained.
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Doi:10.1271/bbb.61.752
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