Formation of isoxazole derivatives via nitrile oxide using ammonium cerium nitrate (CAN): a novel one-pot synthesis of 3-acetyl- and 3-benzoylisoxazole derivatives
作者:Ken-ichi Itoh、C.Akira Horiuchi
DOI:10.1016/j.tet.2003.11.088
日期:2004.2
4-diacetyl-1,2,5-oxadiazole 2-oxide) as the dimer of nitrile oxide. Moreover, it was found that yields of isoxazole derivatives were improved using ammonium cerium(III) nitrate tetrahydrate ((NH4)2Ce(NO3)5·4H2O, CAN(III))-formic acid. The reaction mechanisms based on nitration and formation of nitrile oxide mediated by CAN(IV) or CAN(III) from acetone or acetophenone are also proposed.
烯烃和炔烃与硝酸铈铈(IV)铵((NH 4)2 Ce(NO 3)6,CAN(IV))在丙酮中的回流下反应,得到相应的3-乙酰基-4,5-二氢异恶唑和3-乙酰异恶唑衍生物。在苯乙酮的情况下,获得了3-苯甲酰基-4,5-二氢异恶唑和3-苯甲酰基异恶唑衍生物。丙酮与CAN(IV)反应,得到相应的呋喃烷(3,4-二乙酰基-1,2,5-恶二唑2-氧化物),为一氧化二氮的二聚体。此外,发现使用四水合硝酸铈铈(III)((NH 4)2 Ce(NO 3)5 ·4H 2O,CAN(III))-甲酸。还提出了基于硝化反应并由丙酮或苯乙酮通过CAN(IV)或CAN(III)介导形成一氧化氮的反应机理。