Palladium catalyzed C–H bond acetoxylation: isoxazolinyl as a directing group
作者:Caiwei Geng、Minghui Jiang、Lifei Feng、Peng Jiao
DOI:10.1039/c6ra07793e
日期:——
Pd(OAc)2-catalyzed acetoxylations of 3-aryl or 3-alkyl groups mounted on a 2-isoxazoline ring were studied. Ortho-selective C–H bond activation directed by an isoxazolinyl group was realized. 2-Isoxazoline rings without and with one or two alkyl substituents in the 5-position were effective directing groups. The substituent effect on reactivity and regioselectivity was examined. The acetoxylation was applied
Transformation of arenes into 3-arylpyrazoles and 3-arylisoxazolines with β-bromopropionyl chloride, hydrazine, and hydroxylamine
作者:Takahiro Yamamoto、Hideo Togo
DOI:10.1016/j.tet.2019.130920
日期:2020.2
Successive treatment of arenes with beta-bromopropionyl chloride and AlCl3, followed by the reactions with hydrazines and Na2CO3, and then with MnO2 gave the corresponding 3-arylpyrazoles in one pot in good to moderate yields. The same successive treatment of arenes with beta-bromopropionyl chloride and AlCl3, followed by the reactions with hydroxylamine and KF gave the corresponding 3-arylisoxazolines in one pot in good to moderate yields. (C) 2020 Elsevier Science. All rights reserved.