methylmalonic acid with mono- and disubstituted olefins in the presence of manganese(III) acetate yielded 2-carboxy-2-methyl-4-butanolides in moderate to good yields. The reactions of bromomalonic acid and chloromalonic acid with a variety of olefins gave 2-halo-4-butanolides and/or 2-buten-4-olides. The reaction of ethyl hydrogen malonate with olefins in the presence of manganese(III) acetate yielded
Copper-Catalyzed Aerobic CC Bond Cleavage of Lactols with N-Hydroxy Phthalimide for Synthesis of Lactones
作者:Ya Lin Tnay、Shunsuke Chiba
DOI:10.1002/asia.201403196
日期:2015.4
The transformation of cyclichemiacetals (lactols) into lactones has been achieved by Cu‐catalyzed aerobic CC bond cleavage in the presence of N‐hydroxy phthalimide (NHPI). The present process is composed of a multistep sequence including a) formation of exo‐cyclic enol ethers by dehydration; b) addition of phthalimide N‐oxyl radical to the enol ethers followed by trapping of the resulting C‐radicals
Reaction des organolithiens avec l'ethoxy-5 dihydro-2,5 furannone-2. preparation de †-2 butenolides disubstitues sur le carbone-4.
作者:Francisca Welbaneide Luna Machado-Araujo、Jacques Gore
DOI:10.1016/0040-4020(82)85016-3
日期:1982.1
furfural, leading selectively to 5-hydroxy-2,5-dihydro-furans or to 5-ethoxy-2,5 dihydro-furans disubstituted on carbon 4 ; the odcydation of the hemi-acetals transforms them with good yields in ‡-2butenolides disubstituted on carbon 4.
The Oxidation of 3,3-Diphenyl-2-propenoic Acid with Manganese(III) Acetate
作者:Kazu Kurosawa、Tsuyoshi Tsujita
DOI:10.1246/bcsj.54.2391
日期:1981.8
The oxidation of 3,3-diphenyl-2-propenoic acid with manganese(III) acetate in boiling aceticacid gave 3,3-diphenyl-2-propenyl acetate, 4-acetoxymethyl-5,5-diphenyltetrahydro-2-furanone, 3,3-diphenyl-2-propenal, 5,5-diphenyl-2,5-dihydro-2-furanone, 4-acetoxy-5,5-diphenyltetrahydro-2-furanone, benzophenone, and 2-oxo-5,5-diphenyltetrahydro-4-furancarboxylic acid. The reaction pathways are discussed
Lactone, 1. Mitt. Synthese dihydroxylierter Diphenylethylamine über α-Amino-γ-lactone
作者:Jochen Lehmann
DOI:10.1002/ardp.19823150309
日期:——
Die Umsetzung entsprechender α‐Amino‐γ‐lactone mit Phenyllithium führt zu den 2‐Amino‐1,1‐diphenyl‐alkan‐1,4‐diolen 2a–f, die auch als dihydroxylierte Diphenylethylamine aufgefaßt werden können.