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
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.
Decarboxylative Bromination of Sterically Hindered Carboxylic Acids with Hypervalent Iodine(III) Reagents
reactions; however, they are difficult to synthesize via conventional reactions. We present an efficient and practical method for decarboxylative bromination of sterically hindered 3D aliphatic carboxylicacids using commercially available (diacetoxyiodo)benzene and potassium bromide, one of the most stable and cheapest bromine sources in nature. The present method features a metal-free/Br2-free system