Versatile synthesis of bicyclo[4.3.0]nonenes and bicyclo[4.4.0]decenes by a domino Heck-Diels-Alder reaction
作者:Kiah How Ang、Stefan Bräse、Arno G. Steinig、Frank E. Meyer、Amadeu Llebaria、Katharina Voigt、Armin de Meijere
DOI:10.1016/0040-4020(96)00639-4
日期:1996.8
afterwards in a one-pot process) to give bicyclo[4.3.0]nonene and bicyclo[4.4.0]-decene derivatives in good to excellent yields. Among the examples reported are the first cases of intramolecular Heck reactions with a (bromomethylene)cyclopropane starter or/and a methylenecyclopropane terminator which occur without ring opening of the cyclopropyl group.
CO bond formation between terminal alkenes/benzyl alcohols as an arylcarboxy surrogate and carbonyl compounds in a biodegradable deep eutectic solvent (DES) based on choline chloride and urea was performed. By employment of TBAI as catalyst and TBHP as oxidant, various derivatives of carbonyl compounds were benzylated in α position in good to high yield at 90 °C. Moreover, α-oxybenzoylation of diethyl
Convergent Synthesis of Dihydropyrans from Catalytic Three-Component Reactions of Vinylcyclopropanes, Diazoesters, and Diphenyl Sulfoxide
作者:Ya-Lin Zhang、Rui-Ting Guo、Heng Luo、Xin-Shen Liang、Xiao-Chen Wang
DOI:10.1021/acs.orglett.0c01992
日期:2020.7.17
three-component reaction of vinylcyclopropanes, diazoesters, and diphenyl sulfoxide has been developed. The reaction gives polysubstituted dihydropyrans as the reactionproducts. Mechanistic studies indicate that isomerization of vinylcyclopropanes gives conjugated dienes, which then undergo [4 + 2]-cycloaddition with vicinaltricarbonyl compounds generated by oxygen atom transfer from diphenyl sulfoxide
Various tetra-acceptor-substituted alkenes possessing unsymmetrical substituents have been effectively synthesized from vicinal tricarbonyl compounds. The alkenes have polyfunctionality and high el...
Ester-Substituted Electron-Poor Alkenes for Cycloaddition-Retroelectrocyclization (CA-RE) and Related Reactions
作者:Tristan A. Reekie、Etienne J. Donckele、Laurent Ruhlmann、Corinne Boudon、Nils Trapp、François Diederich
DOI:10.1002/ejoc.201501085
日期:2015.11
the reactions of electron-deficient alkenes, tetrasubstituted by carboxylic ester and cyano groups, with electron-rich (dimethylamino)phenyl-substituted alkynes. Mono- or diester-substituted alkenes exclusively undergo the [2+2] cycloaddition–retroelectrocyclization (CA–RE) reaction, well established for multicyanated ethenes, whereas tri- and tetraester-substituted alkenes also undergo a [4+2] hetero-Diels–Alder