Sunlight-Driven Decarboxylative Alkynylation of α-Keto Acids with Bromoacetylenes by Hypervalent Iodine Reagent Catalysis: A Facile Approach to Ynones
作者:Hui Tan、Hongji Li、Wangqin Ji、Lei Wang
DOI:10.1002/anie.201503479
日期:2015.7.13
A novel and practical decarboxylativealkynylation of α‐keto acids with bromoacetylenes is catalyzed by hypervalent iodine(III) reagents when irradiation by sunlight at room temperature. The product ynones are generated in good yields. Experiments show that results obtained with blue light (λ=450–455 nm) are comparable to those obtained when using sunlight. Mechanistic studies demonstrate that the
Trimethoxyarene as a Highly Ionizable Tag for Reaction Analysis by Atmospheric Pressure Photoionization Mass Spectrometry (APPI/MS): Exploration of Heterocyclic Synthesis
作者:Mathieu Bui The Thuong、Cédric Catala、Cyril Colas、Christine Schaeffer、Alain Van Dorsselaer、André Mann、Alain Wagner
DOI:10.1002/ejoc.201100919
日期:2012.1
A massspectrometry (MS) method was developed to rapidly analyze crude reaction mixtures. This method relies on highly effective ionization by atmosphericpressurephotoionization (APPI) of molecules with a prosthetic trimethoxyarene (TMOA) residue. In a crude reaction mixture, products resulting from the reaction of the TMOA-labeled substrate will be selectively ionized to afford an easily readable
Facile and efficient addition of terminal alkynes to benzotriazole esters: synthesis of d-erythro-sphingosine using ynones as the key intermediate
作者:José Antonio Morales-Serna、Alejandro Sauza、Gabriela Padrón de Jesús、Rubén Gaviño、Gustavo García de la Mora、Jorge Cárdenas
DOI:10.1016/j.tetlet.2013.10.082
日期:2013.12
From the perspective of synthesis, ynones are compounds of considerable interest because of their occurrence in a wide variety of biologically active molecules and as key synthetic intermediates. In this context, a facile and highly efficient synthesis of ynones was developed based on the high reactivity of benzotriazole esters formed in situ. Lithium acetylides can alkylate various carboxylic acids
Copper-catalyzed [4 + 1] cycloaddition reaction of α,β-acetylenicketones with α-diazo esters offers an efficient, direct route to highly substituted furans. The reaction conditions and the scope of the process are examined, and a possible mechanism is proposed.
A Straightforward Synthesis of Ynones by Reaction of Dimethylalkynylaluminum Reagents with Acid Chlorides
作者:Baomin Wang、Martine Bonin、Laurent Micouin
DOI:10.1021/jo050760y
日期:2005.7.1
Alkynyldimethylaluminum reagents react with various aromatic and aliphatic acidchlorides in a fast and efficient way. This reaction provides a simple entry to numerous ynones, using readily available, inexpensive, and nontoxic metalating agent, and does not require any transition metal as a catalyst.