41016-29-9Relevant articles and documents
Facile Synthesis of γ-Butenolides and Maleic Anhydrides via Annulation of α-Keto Acids and Triazenyl Alkynes
Bao, Xiaodong,Cui, Sunliang,Jin, Jian,Zeng, Linwei
, (2022/02/14)
A facile synthesis of γ-butenolides and maleic anhydrides via annulation of α-keto acids and triazenyl alkynes is described. In this process, α-keto acids and triazenyl alkynes could undergo a self-catalyzed annulation at room temperature to deliver γ-butenolides efficiently, while the further addition of BF3-Et2O furnished maleic anhydrides. Overall, these processes have mild reaction conditions, broad scope, and high efficiency.
Efficient electrochemical dicarboxylations of arylacetylenes with carbon dioxide using nickel as the cathode
Yuan, Gao-Qing,Jiang, Huan-Feng,Lin, Chang
, p. 5866 - 5872 (2008/09/21)
The electrochemical dicarboxylation of arylacetylenes with carbon dioxide could be smoothly achieved in an undivided cell using Ni as the cathode and Al as the anode with n-Bu4NBr-DMF as the supporting electrolyte, at a constant current under CO2 pressure of 3 MPa and room temperature in the absence of additional catalysts. The corresponding aryl-maleic anhydrides and 2-arylsuccinic acids were afforded in excellent total yields (82-94%). Under anhydrous conditions, an unsaturated aryl-maleic anhydride as the main product was obtained, while the presence of H2O would lead to the formation of saturated 2-arylsuccinic acids. The results of cyclic voltammetric experiments show that a nickel cathode itself plays the catalytic role in the reduction reaction of arylacetylenes with CO2.
A simple, convenient method for the synthesis of maleic anhydrides from α-keto esters and alkanoic acid anhydrides using the TiCl 4/n-Bu3N reagent system
Kishorebabu, Neela,Periasamy, Mariappan
, p. 2107 - 2109 (2007/10/03)
Reaction of α-keto esters with alkanoic acid anhydrides using the TiCl4/n-Bu3N reagent system gives the corresponding maleic anhydrides in 62-95% yields.
