Friedel–Crafts reactions of acyl trifluoromethanesulfonates and cyclic acylsulfonium cations generated from acyl fluorides
作者:K.V. Raghavendra Rao、Yannick Vallée
DOI:10.1016/j.tet.2016.06.029
日期:2016.7
Reactive acyl trifluoromethanesulfonates are formed from the reaction of acyl fluorides with trimethylsilyl trifluoromethanesulfonate (TMSOTf). These electrophiles undergo Friedel–Crafts reactions with electron-rich aromatics at room temperature. When a sulfur atom is present at their γ position, their cyclization to acylsulfonium cations is observed and is followed by a rearrangement leading to benzothiepinones
Cross‐Coupling of Secondary Amides with Tertiary Amides: The Use of Tertiary Amides as Surrogates of Alkyl Carbanions for Ketone Synthesis
作者:Shu‐Ren Wang、Pei‐Qiang Huang
DOI:10.1002/cjoc.201900215
日期:2019.9
has been made in the field of direct transformation of amides, nevertheless, the condensation between two amides remains rare and restricted to homo‐coupling reactions. Herein, we report the cross‐coupling of secondary amides with tertiary amides, which provides a synthesis of ketones under mild conditions, and features the use of tertiary amides as surrogates of alkyl carbanions. The method relies on
Synergistic Photoredox/Nickel Coupling of Acyl Chlorides with Secondary Alkyltrifluoroborates: Dialkyl Ketone Synthesis
作者:Javad Amani、Gary A. Molander
DOI:10.1021/acs.joc.6b02897
日期:2017.2.3
Visiblelightphotoredox/nickel dual catalysis has been employed in the cross-coupling of acyl chlorides with potassium alkyltrifluoroborates. This protocol, based on single-electron-mediated alkyl transfer, circumvents the restriction of using reactive alkylmetallic nucleophiles in transition-metal-catalyzed acylation and achieves a mild and efficient method for the synthesis of unsymmetrical alkyl
Phase-Vanishing Method: Friedel-Crafts Acylation of Thiophene with Tin Tetrachloride and its Application to Convenient Parallel Synthesis
作者:Ilhyong Ryu、Hiroshi Matsubara、Shinji Yasuda
DOI:10.1055/s-2003-36806
日期:——
Phase-vanishing (PV) method was applied to Friedel-Crafts acylations of aromatic compounds with tin tetrachloride as a Lewis acid. The reaction proceeded smoothly and acylation products were obtained in good yield. Parallel, four different Friedel-Crafts acylation reactions were carried out successfully based on the present PV method.
THE BIRCH REDUCTION OF 2-ACYLTHIOPHENES. SYNTHESIS OF 1,3-DIENYL KETONES FROM 2-ACYLTHIOPHENES
作者:Kimihiko Kosugi、Alexander V. Anisimov、Hiroshi Yamamoto、Ryuichi Yamashiro、Kozo Shirai、Takanobu Kumamoto
DOI:10.1246/cl.1981.1341
日期:1981.10.5
The Birchreduction of 2-acyl or 2-acyl-5-alkylthiophenes and subsequent alkylation by alkyl halides gave 2-acyl-2-alkyl or 2-acyl-2,5-dialkyl-2,5-dihydrothiophenes in good yields. Further, 1,3-dienyl ketones were obtained in good yields by the thermolysis of 2,5-dihydrothiophene 1,1-dioxides which were obtained by the oxidation of resulted dihydrothiophene derivatives with m-chloroperbenzoic acid