1448901-07-2Relevant articles and documents
Synthesis of α-pyrones by catalytic oxidative coupling of terminal alkynes and carbon dioxide
Oliveros-Cruz, Saray,Arévalo, Alma,García, Juventino J.
, p. 18 - 22 (2017/01/10)
The use of the complex [(dippe)Ni(μ-H)]2(1) as a catalyst precursor (10?mol%) in the presence of a variety of terminal alkynes and CO2allowed the production of substituted α–pyrones. This reaction occurs using relatively mild conditions (50?°C, 150 psi of CO2) with good to modest yields, depending on the nature of the substituents in the corresponding alkyne. The produced α–pyrones were characterized by different analytical methods and spectroscopic techniques.
Carboxylative cyclization of substituted propenyl ketones using CO2: Transition-metal-free synthesis of Α-pyrones
Zhang, Wen-Zhen,Yang, Ming-Wang,Lu, Xiao-Bing
supporting information, p. 4181 - 4184 (2016/08/02)
Carbon dioxide is a green carboxylative reagent due to its non-toxic and renewable properties. Described herein is a carboxylative cyclization of substituted 1-propenyl ketones via γ-carboxylation using CO2, which provides an efficient, transit
Diversity-oriented general protocol for the synthesis of privileged oxygen scaffolds: Pyrones, coumarins, benzocoumarins and naphthocoumarins
Goel, Atul,Taneja, Gaurav,Raghuvanshi, Ashutosh,Kant, Ruchir,Maulik, Prakas R.
, p. 5239 - 5253 (2013/08/23)
A new general methodology for the synthesis of various functionalized privileged oxygen heterocyclic scaffolds, viz. pyrones, coumarins, and benzannulated coumarins, is developed. The synthesis proceeds through carbanion-induced ring transformation of lactones with various methylene carbonyl compounds followed by DDQ-mediated unprecedented oxidative cleavage of oxaylidenes intermediates. Studies of the mechanism of the conversions of oxaylidene intermediates into corresponding carbonyl compounds in the presence of DDQ revealed that the reactions took place via the formation of a Michael adduct instead of an intermolecular charge transfer complex. The methodology offers the fabrication of diverse privileged scaffolds with tolerance for many functional groups onto the oxygen heterocyclic molecular framework.