Regio- and stereoselective electrophilic additions to and -2-hydroxy-2-methyl-7-oxabicyclo[2.2.1]hept-5-ene
作者:Odón Arjona、Roberto Fernandez de la Pradilla、Rosa A. Pérez、Joaquín Plumet、Alma Viso
DOI:10.1016/s0040-4039(00)96777-7
日期:1987.1
The regio- and stereoselectivity of electrophilicadditions of PhSeCl and PhSCl to isomeric 2-hydroxy-2-methyl-7-oxabicyclo[2.2.1]hept-5-enes is highly dependent upon the relative stereochemistry of the substrate.
Regio- and stereospecific synthesis of substituted cyclohexenediols from 7-oxabicyclo[2.2.1]hept-5-en-2-ols and organolithium reagents
作者:Odón Arjona、Roberto Fernández de la Pradilla、Ernesto García、Angel Martin-Domenech、Joaquín Plumet
DOI:10.1016/s0040-4039(01)93916-4
日期:1989.1
The bridge opening reactions of 7-oxabicyclo[2.2.1]hept-5-en-2-ols,4 and6 with organolithium reagents proceed with complete regio- and stereoselectivity to produce highly functionalized cyclohexene derivatives5 and7, respectively.
Stereoselectivity of the reaction between 7-oxabicyclo[2.2.1]hept-5-en-2-one and organocuprate reagents
作者:Odón Arjona、Roberto Fernández de la Pradilla、Cristina Manzano、Sonia Pérez、Joaquín Plumet
DOI:10.1016/s0040-4039(00)96776-5
日期:1987.1
Lithium organocuprates add with high stereoselectivity to the hindered face of the carbonyl group of 7-oxabicyclo[2.2.1]hept-5-en-2-one to yield the corresponding alcohols.
Temperature-controlled synthesis of 4,7-dioxatricyclo[3.2.1.03,6]octane derivatives
作者:Odon Arjona、Roberto Fernandez de la Pradilla、Joaquin Plumet、Alma Viso
DOI:10.1021/jo00028a074
日期:1992.1
Sulfone Directed Alkylative Bridge Cleavage of Oxabicyclic Vinyl Sulfones with Organolithium Reagents
作者:Odon Arjona、Alfonso de Dios、Roberto Fernandez de la Pradilla、Joaquin Plumet、Alma Viso
DOI:10.1021/jo00093a024
日期:1994.7
An efficient regio- and stereocontrolled methodology for the alkylative bridge cleavage of oxabicyclic vinyl sulfones is described. A range of 7-oxabicyclo[2.2.1]heptenyl and 8-oxabicyclo[3.2.1]octenyl sulfones has been found to undergo an overall syn S(N)2' opening when treated with a wide variety of organolithium reagents and lithium aluminum hydride. In this manner, highly functionalized cyclohexenyl and cycloheptenyl sulfones, versatile synthetic intermediates, are now available in high yields. The complete stereoselectivity encountered in the exo conjugate addition may be explained by chelation of the organometallic reagent with the oxygen bridge and steric factors. Furthermore, less-strained substrates allow for complete control of the addition and elimination stages.