synthesis of a series of functionalized cyclobutane and cyclobutene L-nucleoside analogues featuring a methylene spacer between the carbocycle and the nucleobase. These L-nucleoside analogues were subjected to comprehensive screening for antiviral activity. To obtain knowledge at the molecular structural level relevant for designing future analogues, the mechanism of action of these L-nucleoside analogues
Photocycloaddition of (Z)-1,2-dichloroethylene to enantiopure 2(5H)-furanones: an efficient strategy for the diastereoselective synthesis of cyclobutane and cyclobutene derivatives
作者:Ramon Alibés、Pedro de March、Marta Figueredo、Josep Font、Marta Racamonde、Albert Rustullet、Angel Alvarez-Larena、Juan F. Piniella、Teodor Parella
DOI:10.1016/s0040-4039(02)02528-5
日期:2003.1
A highly stereoselective and efficient synthetic approach to cyclobutane and cyclobutene derivatives has been developed consisting of a [2+2] photochemical cycloaddition of chiral 2(5H)-furanones to (Z)-1,2-dichloroethylene followed by dihydrodehalogenation or dihaloelimination.
Photochemical [2 + 2] Cycloaddition of Acetylene to Chiral 2(5<i>H</i>)-Furanones
作者:Ramon Alibés、Pedro de March、Marta Figueredo、Josep Font、Xiaolin Fu、Marta Racamonde、Ángel Álvarez-Larena、Juan F. Piniella
DOI:10.1021/jo0264731
日期:2003.2.1
The [2 + 2] photocycloaddition of acetylene to chiral 2(5H)-furanones was investigated. The influence on the chemical yield and facial diastereoselectivity of the substituent at the stereogenic center and also the effect of a 4-methyl group were evaluated. A mechanistic proposal based on a simple theoretical conformational analysis is presented. Using a C(2)-symmetric bis(lactone) as the substrate
[2+2] Photocycloaddition of homochiral 2(5H)-furanones to alkenes. First step for an efficient and diastereoselective synthesis of (+)- and (−)-grandisol
作者:Ramón Alibés、José L. Bourdelande、Josep Font、Anna Gregori、Teodoro Parella
DOI:10.1016/0040-4020(95)00957-4
日期:1996.1
The [2+2] photocycloaddition of homochiral 5-alkyl-2(5H)-furanones to alkenes is studied in order to evaluate the influence of the stereogenie centre to induce facial diastereoselectivity. The major cycloadduct could be transformed, eventually, in (+)-grandisol, The existence of a charge-transfer complex between the furanone and electron rich substituted alkenes as well as the formation of a predominant
[2+2] Photocycloaddition of Symmetrically Disubstituted Alkenes to 2(5H)-Furanones: Diastereoselective Entry to 1,2,3,4-Tetrasubstituted Cyclobutanes
作者:Sònia Parés、Pedro de March、Josep Font、Ramon Alibés、Marta Figueredo
DOI:10.1002/ejoc.201100067
日期:2011.7
A study on the [2+2] photochemical cycloaddition of 1,4-difunctionalized 2-butenes to 2(5H)-furanones is presented. These reactions deliver 1,2,3,4-tetrasubstituted cyclobutanes with suitable functionalization in the four side chains for further synthetic elaboration. The effects of the substituents in both the lactone and the 2-butene on the stereoselectivity of the photochemical reaction have been