A highly efficient domino method for the synthesis of trisubstitutedisoxazoles has been established from α-nitro carbonyl compounds and methyl ketones or terminal aryl alkenes. Simple and readily available starting materials, mild reaction conditions and very simple operation are significant advantages of the reaction.
Synthesis of pyrrolo[2,1-a]isoquinolines from activated acetylenes, benzoylnitromethanes, and isoquinoline
作者:Issa Yavari、Mohammad Piltan、Loghman Moradi
DOI:10.1016/j.tet.2009.01.001
日期:2009.3
Isoquinoline reacts smoothly with aroylnitromethanes in the presence of dialkyl acetylenedicarboxylates and dibenzoylacetylene to produce pyrrolo[2,1,a]isoquinolines in good yields. Quinoline and benzothiazole also react in a similar way. Pyridine and N-methylimidazole catalyze the reaction between nitromethane derivatives with electron-deficient acetylenes to produce highly functionalized isoxazoles. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Furoxans and Isoxazoles via Divergent [2 + 1 + 1 + 1] Annulations of Sulfoxonium Ylides and <sup>t</sup>BuONO
作者:Zhonghe Tang、Yao Zhou、Qiuling Song
DOI:10.1021/acs.orglett.9b01876
日期:2019.7.5
isoxazoles in which the [2 + 1 + 1 + 1] annulation reaction of sulfoxonium ylides is reported for the first time. When the reaction was performed using tBuONO as the nitrogen source without metal catalyst, the desired furoxans were obtained in decent yields with wide substrate scope. Isoxazoles bearing three carbonyl groups were achieved when the reaction was conducted using Cu(TFA)2 as catalyst.