中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
3alpha-羟基-2,3A,4,5,6,7-六氢-3H-吲唑-3-酮 | 9-Hydroxy-3-oxo-2,3,4,5,6,7-hexahydroindazol | 107398-92-5 | C7H10N2O2 | 154.169 |
—— | 3,4-tetramethylene-4-chloro-2-pyrazolin-5-one | 19462-59-0 | C7H9ClN2O | 172.614 |
—— | 4,5,6,7,4',5',6',7'-Octahydro-2H,2'H-[3a,3'a]biindazolyl-3,3'-dione | 107398-94-7 | C14H18N4O2 | 274.323 |
N,N-dialkyl-N′-chlorosulfonyl chloroformamidines 1 reacted with pyrazol-3-ones 2 under a variety of conditions to give pyrazolo[2,3-e][1,2,3,5]oxathiadiazine dioxides 3 and pyrazolo[3,2-b][1,4,3,5]oxathiadiazine dioxides 5, and frequently, one or both of pyrazolo[1,2-b][1,2,3,5]thiatriazole 1,1,5-trioxides 4 and 1,1,7-trioxides 6. In all reactions, the pyrazolo[3,2-b][1,4,3,5]oxathiadiazine 5 was the major product, with the pyrazolo[2,3-e][1,2,3,5]oxathiadiazine 3 being a significant product in the absence of base. Prior to our recent work, the core ring systems of compounds 3 and 5 had not been reported and compounds 4 and 6 are new derivatives of a rare ring system.