Auf das Zentralnervensystem wirkende Substanzen XXV. Reaktionen der ?-substituierten ?-Lactone II. Eine neue allgemeine Synthese ?-substituierter Propions�uren und deren Derivate
作者:Bruno J. R. Nicolaus、Luigi Mariani、Emilio Testa
DOI:10.1002/hlca.19610440427
日期:——
Hydrochloric acid and hydrobromic acid react with α-mono- and α, α-disubstituted β-lactones under ring cleavage leading unequivocally to the corresponding α-mono- or α, α-disubstituted β-halogenopropionic acids. These products are interesting starting materials for the preparation of new compounds and can be reduced by zinc and formic acid to the corresponding propionic acids. The described synthesis
SYSTEMS AND METHODS FOR REGIOSELECTIVE CARBONYLATION OF 2,2-DISUBSTITUTED EPOXIDES FOR THE PRODUCTION OF ALPHA,ALPHA-DISUBSTITUTED BETA-LACTONES
申请人:Cornell University
公开号:US20210024479A1
公开(公告)日:2021-01-28
Provided are methods of producing carbonyl compounds (e.g., carbonyl containing compounds) and catalysts for producing carbonyl compounds. Also provided are methods of making polymers from carbonyl compounds and polymers formed from carbonyl compounds. A method may produce carbonyl compounds, such as, for example α,α-disubstituted carbonyl compounds (e.g., α,α-disubstituted β-lactones). The polymers may be produced from α,α-disubstituted β-lactones, which may be produced by a method described herein.
Pt-Catalyzed Rearrangement of Oxaspirohexanes to 3-Methylenetetrahydrofurans: Scope and Mechanism
作者:Christian A. Malapit、Sampada M. Chitale、Meena S. Thakur、Rosa Taboada、Amy R. Howell
DOI:10.1021/acs.joc.5b00604
日期:2015.5.15
A novel Pt-catalyzed rearrangement of oxaspirohexanes to 3-methylenetetrahydrofurans is reported. Mechanistic studies by 13C-labeling experiments confirm oxidative addition of Pt(II) regioselectively to the least substituted carbon–carbon bond of the cyclopropane to form a platinacyclobutane intermediate. To our knowledge, this is the first alkoxy-substituted platinacyclobutane that has been observed
One-Step Electrocatalytic Approach Applied to the Synthesis of β-Propiolactones from CO<sub>2</sub> and Dienes
作者:Renate Schwiedernoch、Xiaofeng Niu、Haosheng Shu、Stephan N. Steinmann、Mengjia Wu、Negar Naghavi
DOI:10.1021/acs.joc.2c02441
日期:2023.8.4
β-lactone synthesis relies on laborious multi-step synthetic methods that use toxic compounds, sophisticated catalysts, expensive, and/or reactive chemicals. Based on the in situ electrochemical formation of metal-based nanoclusters, this paper describes the development of a one-step, room temperature electrocatalytic method for the formation of stable β-lactone from CO2 and dienes. This one-step “electrosynthesis”