A catalytic process for trifluoromethylation of terminalalkynes with Togni’s reagent has been developed, affording trifluoromethylated acetylenes in good to excellent yields. The reaction is conducted at room temperature and exhibits tolerance to a range of functional groups.
Direct Synthesis of a Trifluoromethyl Copper Reagent from Trifluoromethyl Ketones: Application to Trifluoromethylation
作者:Hiroki Serizawa、Kohsuke Aikawa、Koichi Mikami
DOI:10.1002/chem.201303828
日期:2013.12.23
fluorine: The direct synthesis of CuCF3 from a cuprate reagent and trifluoromethyl ketones, as one of the most economical and efficient trifluoromethyl sources, was accomplished. The advantages of this method are all of reagents employed are low‐cost, operation is simple, and the yield of CuCF3 is virtually quantitative (see scheme). Furthermore, three types of trifluoromethylations smoothly proceeded
We demonstrate the iron-catalyzed intermolecular coupling of internal alkynes and thiosalicylic acid derivatives. The reaction was effectively catalyzed by the Fe(acac)2/1,10-phenanthroline catalyst in toluene/HFIP (hexafluoroisopropyl alcohol) as the reaction solvent and afforded several types of 1,3-oxathiine derivatives in moderate to high yields through the intermolecular hydrothiolation and sequential
Synthesis of Trifluoromethylated Dibenzoxepines via Palladium-Catalyzed Tandem C–O Bond Formation/C–H Arylation
作者:Zhi-Yi Zhao、Xing-Guo Zhang、Hai-Yong Tu
DOI:10.1021/acs.joc.3c01770
日期:2023.10.6
palladium-catalyzed cyclization reaction of phenols with trifluoromethyl-containing ortho-bromo-β-chlorostyrenes has been developed. In the presence of palladium(II) acetate, tricyclohexylphosphine, and cesium carbonate, a variety of 6-trifluoromethyldibenzo[b,d]oxepines were prepared in moderate to good yields through the tandem O-alkenylation of general phenols and subsequent C–H arylation.
已开发出钯催化的苯酚与含三氟甲基的邻-溴-β-氯苯乙烯的环化反应。在乙酸钯(II)、三环己基膦和碳酸铯存在下,通过一般酚类的串联 O-烯基化和随后的 C-H 芳基化,以中等至良好的产率制备了多种 6-三氟甲基二苯并[ b , d ]氧杂环己烷。
CuI/TMEDA-Catalyzed Annulation of 2-Bromo Alkynylbenzenes with Na<sub>2</sub>S: Synthesis of Benzo[<i>b</i>]thiophenes
A copper-catalyzed thiolation annulation reaction of 2-bromo alkynylbenzenes with sodium sulfide has been developed. In the presence of CuI and TMEDA, a variety of 2-substituted benzo[b]thiophenes were readily prepared in moderate to good yields by the reaction of 2-bromo alkynylbenzenes and Na2S center dot 9H(2)O.