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
Isoxazole Strategy for the Synthesis of α-Aminopyrrole Derivatives
作者:Ekaterina E. Galenko、Stanislav A. Linnik、Olesya V. Khoroshilova、Mikhail S. Novikov、Alexander F. Khlebnikov
DOI:10.1021/acs.joc.9b01634
日期:2019.9.6
The synthesis of methyl 5-aminopyrrole-3-carboxylates from 4-methyleneisoxazol-5-ones via “cyanide Michael addition/methylation/reductive isoxazole-pyrrole transformation” is developed. The last step occurs in a domino mode involving Mo(CO)6-mediated reductive isoxazole ring-opening, Mo(CO)6-catalyzed cis–trans-isomerization of the enamine intermediate followed by 1,5-exo-dig cyclization. 5-Amino-
通过“氰化物迈克尔加成/甲基化/还原异恶唑-吡咯转化”,由4-亚甲基异恶唑-5-酮合成5-氨基吡咯-3-羧酸甲酯。最后的步骤发生在涉及的Mo(CO)多米诺模式6介导的还原性异恶唑开环,钼(CO)6 -催化的顺式-反式,接着1,5-烯胺中间体的-isomerization外型-挖环化。5-氨基-1 H-吡咯-3-羧酸盐与1,3-二酮反应,得到吡咯并[1,2- a ]嘧啶-7-羧酸盐,并易于转化为2-重氮-2 H-吡咯-4-羧酸盐。这些化合物证明了两种重氮化合物的反应性,它们在光解作用下产生了含吡咯的分子内/分子间偶氮偶合产物,而卡宾化合物则使含吡咯的插入产物形成了CH和OH键。
An easy protocol for the domino synthesis of diversely functionalized spirocarbocycles and their biological evaluation
作者:SELVARANGAM E KIRUTHIKA、PARAMASIVAN T PERUMAL、C BALACHANDRAN、S IGNACIMUTHU
DOI:10.1007/s12039-013-0560-1
日期:2014.1
reported. This consists of a series of steps including Knoevenagel condensation followed by intermolecular vinylogous Michael addition and intramolecular cyclization. The synthesized compounds were evaluated for their antimicrobial activity and the compounds exhibited moderate to excellent activities. Synopsis: A base catalyzed domino reaction for the synthesis of spirocarbocycles in excellent yields