Facile one-pot synthesis of 5-substituted isoxazoles and pyrazoles through microwave-promoted intramolecular cyclization of <font>γ</font>-hydroxyalkynal oximes and hydrazones
作者:Denis A. Bulanov、Irina A. Novokshonova、Vladimir V. Novokshonov、Igor A. Ushakov、Irina V. Sterkhova
DOI:10.1080/00397911.2016.1263892
日期:2017.2.16
ABSTRACT Simple and efficient one-pot synthesis of 5-substituted isoxazoles and pyrazoles has been developed. The formation of the target isoxazoles and pyrazoles is initiated by 1,2-nucleophilic addition of generated in situ hydroxylamine or hydrazine to α-acetylenic γ-hydroxyaldehydes with further intramolecular cyclization of the adducts. The protocols are associated with readily available substrates