Silver-Catalyzed Vinylogous Fluorination of Vinyl Diazoacetates
摘要:
A silver-catalyzed vinylogous fluorination of vinyl diazoacetates to generate gamma-fluoro-alpha,beta-unsaturated carbonyls is presented. Application of this method to the fluorination of farnesol and steroid derivatives was achieved.
Rhodium(II)-Catalyzed Cross-Coupling of Diazo Compounds
作者:Jørn H. Hansen、Brendan T. Parr、Philip Pelphrey、Quihui Jin、Jochen Autschbach、Huw M. L. Davies
DOI:10.1002/anie.201004923
日期:2011.3.7
left to chance: A convenient protocol for selective cross‐coupling of diazocompounds for the convergent synthesis of alkenes was developed (see scheme; EDG=aryl, heteroaryl, vinyl; R=O‐alkyl, aryl). The selectivity control elements were identified by ReactIR and DFT calculations and provide a framework for the design of viable diazo coupling reactions.
没事了:开发了用于重氮合成烯烃的重氮化合物选择性交叉偶联的便捷方案(见方案; EDG =芳基,杂芳基,乙烯基; R = O-烷基,芳基)。通过ReactIR和DFT计算确定了选择性控制元素,并为可行的重氮偶合反应设计提供了框架。
Synthesis of [18F]-γ-Fluoro-α,β-unsaturated Esters and Ketones via Vinylogous 18F-Fluorination of α-Diazoacetates with [18F]AgF
作者:Stephen Thompson、So Jeong Lee、Isaac M. Jackson、Naoko Ichiishi、Allen F. Brooks、Melanie S. Sanford、Peter J. H. Scott
DOI:10.1055/s-0039-1690012
日期:2019.12
a fluorinated cholest-5-en-3-one derivative as well as a difluorinated product pertinent to drug discovery. This communication reports a method for the vinylogous radiofluorination of α-diazoacetates to generate [18F]-γ-fluoro-α,β-unsaturated esters and ketones in moderate to good radiochemical yields. The method uses no-carrier-added [18F]AgF and is compatible with aromatic and non-aromatic substrates
Synthesis of Allylboranes via Cu(I)-Catalyzed B–H Insertion of Vinyldiazoacetates into Phosphine–Borane Adducts
作者:Denis Drikermann、Robert S. Mößel、Walid K. Al-Jammal、Ivan Vilotijevic
DOI:10.1021/acs.orglett.9b04619
日期:2020.2.7
Cu(I) catalysts enable C-B bond formation via direct insertion of vinyldiazoacetates into B-H bonds of borane-phosphine Lewis adducts to form phosphine-protected allylboranes under mild conditions. The resulting allylborane-phosphine Lewis adducts can be used in the diastereoselective allylation of aldehydes directly without the need for removal of the phosphine. The allylation reaction proceeds with
Vinyldiazo compounds undergo a thermal electrocyclization to form pyrazoles in yields of up to 95%. The reactions are operationally simple, use readily available starting materials, require no intervention of a catalyst, and enable the synthesis of mono-, di- and tri-substituted pyrazoles. With the ability to produce highly substituted pyrazoles and the flexibility in installing various types of substituents
C−H Activation as a Strategic Reaction: Enantioselective Synthesis of 4-Substituted Indoles
作者:Huw M. L. Davies、James R. Manning
DOI:10.1021/ja057768+
日期:2006.2.1
A method is described for the asymmetric synthesis of 4-substitutedindoles from the Rh2(S-DOSP)4-catalyzed decomposition of vinyldiazoacetates in the presence of N-Boc-4-acetoxy-6,7-dihydroindole. The reaction proceeds via a combined C-H activation/Cope rearrangement-elimination mechanism resulting in good yields and very high asymmetric induction.