Enol elimination reactions. Part III. The scope and limitations of eliminations involving enol sulphonates
作者:E. J. D. Brown、John Harley-Mason
DOI:10.1039/j39660001390
日期:——
Eliminationreactions of enolsulphonates have been further studied. The enolsulphonates of p-anisolyl-, 2-furoyl-, and 2-thenoyl-malonic esters readily gave the corresponding propiolic acids on treatment with base, whereas the enolsulphonates of o-, m-, and p-nitrobenzoylmalonic esters gave negligible yields. The enolsulphonates of cyclopropylcarbonylmalonate gave cyclopropylpropiolic acid, while
Synthesis of novel 5-alkyl/aryl/heteroaryl substituted diethyl 3,4-dihydro-2<i>H</i>-pyrrole-4,4-dicarboxylates by aziridine ring expansion of 2-[(aziridin-1-yl)-1-alkyl/aryl/heteroaryl-methylene]malonic acid diethyl esters
作者:Satish S More、T Krishna Mohan、Y Sateesh Kumar、U K Syam Kumar、Navin B Patel
DOI:10.3762/bjoc.7.95
日期:——
A novel synthetic methodology has been developed for the synthesis of diethyl 5-alkyl/aryl/heteroaryl substituted 3,4-dihydro-2H-pyrrole-4,4-dicarboxylates (also called 2-substituted pyrroline-4,5-dihydro-3,3-dicarboxylic acid diethyl esters) by iodide ion induced ring expansion of 2-[(aziridin-1-yl)-1-alkyl/aryl/heteroaryl-methylene]malonic acid diethyl esters in very good to excellent yields under
Substitution controlled aryne insertion: synthesis of diarylmethane/chromones
作者:Jadhav Rahul Dhanaji、Polasani Samatha、Silver Raju、Prathama S. Mainkar、Raju Adepu、Srivari Chandrasekhar
DOI:10.1039/d2cc05992d
日期:——
Aryne insertion reaction with 2-aroyl malonates/cyanoesters lead to the formation of diarylmethane or chromones depending on the substitution on the aryne ring. The presence of an electronegative atom at the ortho position of arynes generates chromones, whereas other arynes lead to the formation of diarylmethanes, via a cascade double aryne insertion.