Transformation of arenes into 3-arylpyrazoles and 3-arylisoxazolines with β-bromopropionyl chloride, hydrazine, and hydroxylamine
摘要:
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.
Synthesis of Piperidin-4-one Derivatives via α-Imino Rhodium Carbene-Initiated 1,2-Aryl/Alkyl Migration and Annulation
作者:Xiaojing Xu、Huan Luo、Jiayi Shen、Jing Chen、Jie Ye、Ze-Feng Xu、Chuan-Ying Li
DOI:10.1021/acs.orglett.3c01693
日期:2023.7.7
Valuable piperidin-4-one derivatives were synthesized in excellent yields via an α-imino carbene-initiated cascade reaction involving 1,2-aryl/alkyl migration and annulation. The excellent selectivity of alkyl migration was attributed to the neighboring group participation of 2-bromoethyl. Features such as high efficiency, excellent migrating selectivity, broad substrate scope, and convenient one-pot