Facile and expedient synthesis of α,β-unsaturated isoxazol-5(4H)-ones under mild conditions
作者:Fatemeh Ghorbani、Hamzeh Kiyani、Seied Ali Pourmousavi
DOI:10.1007/s11164-019-03999-7
日期:2020.1
three-component cyclocondensation of aryl/heteroaryl aldehydes, hydroxylamine hydrochloride, and β -ketoesters toward the synthesis of α , β -unsaturated isoxazol-5(4 H )-ones under green conditions. The reaction yielded the corresponding heterocycles at room temperature in relatively shorter reaction times. It merits mentioning that the mild conditions allow the synthesis of several α , β -unsaturated isoxazol-5(4
摘要 发现芳基/杂芳基醛,羟胺盐酸盐和 β- 酮酸酯的三组分环缩合反应可催化 纳米SiO 2 -H 2 SO 4合成 α , β- 不饱和异恶唑-5(4 H )-在绿色条件下。该反应在室温下以相对较短的反应时间产生相应的杂环。值得一提的是,温和的条件允许合成几种 α , β- 不饱和异恶唑-5(4 H )-使用此方法的人。在这项研究中,还合成并表征了一些新的异恶唑酮衍生物。它高效,清洁,简单,安全且生态友好。这种简单的方法具有成本效益,并且不需要制备反应物。在不使用能量源(例如热,超声波和微波辐射)的情况下进行三组分环化。 图形摘要
Reaction of 4-arylmethylene-3-phenylisoxazolones and 4-arylmethylene-1,3-diphenylpyrazolones with enamines and nucleophilic heterocycles
作者:David C. Cook、Alexander Lawson
DOI:10.1039/p19740001112
日期:——
4-Arylmethylene-3-phenylisoxazolones (1) and 4-arylmethylene-1,3-diphenylpyrazolones (2) were treated with enamines (8), 3-phenylisoxazol-5(4H)-one (4), 1,3-diphenylpyrazol-5(4H)-one (6), and 2-phenyloxazol-5(4H)-one (3). The enamines were β-alkylated to give 1:1 adducts (9) and (10). The reaction of (1) with (6) and (2) with (4) gave symmetrical benzylidenedi-isoxazolones and -pyrazolones (7). 2-
Fast and Efficient Synthesis of 4-Arylidene-3-phenylisoxazol-5-ones
作者:Maryam Mirzazadeh、Gholam Hossein Mahdavinia
DOI:10.1155/2012/562138
日期:——
A convenient and easy synthesis of 4-arylidene-3-phenylisoxazol-5-ones by the three-component reaction of hydroxylamine, ethyl benzoylacetate and aromatic aldehydes in the presence of DABCO in refluxing ethanol is reported.
The convenient synthesis of 4-arylmethylidene-4,5- dihydro-3-phenylisoxazol-5-ones
作者:Keyume Ablajan、Hainimu Xiamuxi
DOI:10.1016/j.cclet.2010.09.023
日期:2011.2
Abstract 4-Arylmethylidene-4,5-dihydro-3-phenylisoxazol-5-ones were synthesized by the convenient three-component reaction of ethylbenzoylacetate, hydroxylamine and aromatic aldehydes in the presence of pyridine. The target compounds were also obtained by the reaction between 3-phenylisoxazol-5-one and aromatic aldehydes at 105 °C under solvent free condition. Yields of products depended considerably
The exocyclic double bond in 4-arylidene-3-substituted-isoxazolin-5-one (I) undergoes addition reactions with Grignard reagents and with benzene in the presence of aluminiumchloride. Treatment of 4-arylazo derivatives of 3-substituted-isoxazolin-5-ones (III) with Grignard reagents does not effect hetero-ring opening and only the carbonyl group of III enters into reaction, followed by elimination of