89726-37-4Relevant articles and documents
Reactions of Azines. 8. Rearrangement of 1-Oxo-3,4,8-triaza-2,4,6,7-octatetraenes to 2,3-Dihydro-1H-imidazopyrazol-2-ones and 4,9-Dihydropyrazoloquinazolines
Schweizer, Edward E.,Lee, Kee-Jung
, p. 1964 - 1969 (2007/10/02)
Reactions of phosphoranes 1 with isocyanates 2 have given excellent yields of 4,9-dihydropyrazoloquinazolines 10 and 2,3-dihydro-1H-imidazopyrazol-2-ones 13 presumably via the intermediate 1-oxo-3,4,8-triaza-2,4,6,7-octatetraenes 3.The ratio