Synthesis of trifluoromethylated isoxazoles and their elaboration through inter- and intra-molecular C–H arylation
作者:Jian-Siang Poh、Cristina García-Ruiz、Andrea Zúñiga、Francesca Meroni、David C. Blakemore、Duncan L. Browne、Steven V. Ley
DOI:10.1039/c6ob00970k
日期:——
conditions for the preparation of a range of trifluoromethylated isoxazole building blocks through the cycloaddition reaction of trifluoromethyl nitrile oxide. It was found that controlling the rate (and therefore concentration) of the formation of the trifluoromethyl nitrile oxide was Critical for the preferential formation of the desired isoxazole products versus the furoxan dimer. Different conditions were
One-Pot Synthesis of Trifluoromethylated Iodoisoxazoles via the Reaction of Trifluoroacetohydroximoyl Chloride with Terminal Alkynes and N-Iodosuccinimide
Trifluoromethylated iodoisoxazoles have been synthesized by the reaction of trifluoroacetohydroximoyl chloride, alkynes, and N-iodosuccinimide in a one-pot reaction under metal-free and mild conditions. An array of iodoisoxazole compounds with a wide range of functionalities was obtained in moderate to good yields. The iodine-substituted isoxazoles render versatile reaction sites for subsequent conversion
The regio- and stereoselectivity of the cydoadditions of trifluoroacetonitrileoxide (1) with olefins and acetylenes were described. The oxide 1, generated in situ from trifluoroacetohydroximoyl bromide etherate in the presence of triethylamine, reacted with various monosubstituted olefins and acetylenes to give exclusively 5-substituted 3-trifluoromethyl-2-isoxazolines and -isoxazoles, respectively
作者:Joseph C. Sloop、Carl L. Bumgardner、W.David Loehle
DOI:10.1016/s0022-1139(02)00221-x
日期:2002.12
Selected 1,3-diketones having a trifluoromethyl group and/or a fluorine in the 2-position were condensed with aromatic hydrazines, hydroxylamine, urea, thiourea, guanidine, and substituted anilines producing pyrazoles, isoxazoles, pyrimidines, and quinolines, respectively, in yields ranging from 27 to 87%.
Cu-Catalyzed Synthesis of Fluoroalkylated Isoxazoles from Commercially Available Amines and Alkynes
作者:Xiao-Wei Zhang、Wen-Li Hu、Suo Chen、Xiang-Guo Hu
DOI:10.1021/acs.orglett.7b04028
日期:2018.2.2
A one-potprotocol for the construction of fluoroalkylated isoxazoles directly from commercially available amines and alkynes is described. The reaction is scalable, operationally simple, regioselective, mild, and tolerant of a broad range of functional groups. As such, it could be viewed as a “click synthesis” of fluoroalkylated isoxazoles. Preliminary mechanistic investigations reveal that the transformation
描述了一种直接从市售胺和炔烃构建氟代烷基化异恶唑的一锅法操作规程。该反应是可扩展的,操作简单的,区域选择性的,温和的,并且耐受多种官能团。因此,可以将其视为氟代烷基化异恶唑的“点击合成”。初步的机械研究表明,该转化涉及涉及R f CHN 2的空前的Cu催化级联序列。