Efficient and Regioselective One-Pot Synthesis of 3-Substituted and 3,5-Disubstituted Isoxazoles
作者:Shibing Tang、Jinmei He、Yongquan Sun、Liuer He、Xuegong She
DOI:10.1021/ol901626n
日期:2009.9.3
A series of 3-substituted and 3,5-disubstitutedisoxazoles have been efficiently synthesized in moderate to excellent yields by the reaction of N-hydroxyl-4-toluenesulfonamide with α,β-unsaturated aldehydes/ketones. This novel strategy is associated with readily available starting materials, mild conditions, high regioselectivity, and wide scope.
Trichloroisocyanuric acid mediated one-pot synthesis of 3,5-diarylisoxazoles from <i>α,β</i>-unsaturated ketones
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant
DOI:10.1080/00397911.2019.1590848
日期:2019.4.18
Abstract A facile one-pot synthesis of 3,5-diarylisoxazoles from α,β-unsaturatedketones and hydroxylamine hydrochloride is reported. The reaction is efficiently promoted by trichloroisocyanuric acid (TCCA) to afford the desired products, mostly in high yields and in relatively short time. The mild nature of the synthesis and short reaction time are notable advantages of the developed protocol. This
<i>o</i>-Iodoxy Benzoic Acid–Mediated Synthesis of 3,5-Diarylisoxazoles and Isoxazole-3-carboxylic Acids
作者:Vidya G. Desai、Sneha R. Naik、Kashinath L. Dhumaskar
DOI:10.1080/00397911.2013.854916
日期:2014.5.19
Abstract A new, convenient, ecofriendly synthesis of 3,5-diarylisoxazoles is reported from α,β-unsaturated ketoximes. Similarly, a novel synthesis of isoxazole carboxylic acids is also reported. Both the methods use efficient, environmentally friendly, and nontoxic iodoxybenzoic acid (IBX) as an oxidative cyclizing reagent. Easy procedure, environmentally benign reaction conditions, and nontoxicity
1,3-Dipolar cycloaddition reaction applied to synthesis of new unsymmetric liquid crystal compounds-based isoxazole
作者:André A. Vieira、Fernando R. Bryk、Gilmar Conte、Adailton J. Bortoluzzi、Hugo Gallardo
DOI:10.1016/j.tetlet.2008.12.021
日期:2009.2
ring compounds exhibited mesomorphism. Smectic C, smectic A, and nematic phases were observed by optical microscopy and DSC analysis. The yield of these reactions varied from moderate to excellent (47–93%). The structure of the rigid core was investigated by single crystal X-ray diffraction, which confirmed the regioselectivity of the [3+2] dipolar cycloaddition reaction.
A convenient one-pot synthesis of 3,5-diarylisoxazoles via oxidative cyclisation using catalytic CuBr2 and oxone
作者:Ashish Bhatt、Rajesh K. Singh、Ravi Kant
DOI:10.1016/j.tetlet.2019.03.044
日期:2019.4
A facile one-pot synthesis of 3,5-diarylisoxazoles from α,β-unsaturated ketones and hydroxylamine hydrochloride is reported. The reaction is efficiently promoted by catalytic CuBr2 and Oxone to afford the desired products mostly in high yields and in relatively short time. The mild nature of the synthesis and short reaction time are notable advantages of the developed protocol. This protocol is effective