Polar vs steric effects in the 1,3-dipolar cycloaddition reactions of acetonitrile oxide and 2-endO-acetoxy-5-halo-7-oxabicyclo[2.2.1]hept-5-en-2-exo-carbonitrile
作者:Odön Arjona、Alfonso de Dios、Roberto Fernandez de la Pradilla、Araceli Mallo、Joaquin Plumet
DOI:10.1016/s0040-4020(01)81474-5
日期:——
The regioselectivity of the cycloaddition reactions between acetonitrile oxide and a number of 7-oxabicyclo[ 2.2.1]hept-5-enes is discussed. Acetonitrile oxide adds with complete regioselectivity to 2-endo-acetoxy-5-halo-7-oxabicyclo[2.2.1]hept-5-en-2-exo-carbonitriles. Kinetic measurements indicate a more polar transition state for 2a than for the unsubstituted substrate la
1,3-Dipolar cycloadditions between nitrile oxides and substituted 7-oxabicyclo[2.2.1]heptenes
作者:Odon Arjona、Carmen Dominguez、Roberto Fernandez de la Pradilla、Araceli Mallo、Cristina Manzano、Joaquin Plumet
DOI:10.1021/jo00286a018
日期:1989.12
Control of the Regioselectivity in the Pauson−Khand Reaction of 7-Oxanorbornene Derivatives
作者:Odón Arjona、Aurelio G. Csákÿ、M. Carmen Murcia、Joaquín Plumet
DOI:10.1021/jo9903095
日期:1999.10.1
The regiochemistry of the Pauson-Khand reaction of 7-oxanorbornene derivatives can be influenced by a remote substituent at carbon C-2. Furthermore, a remarkable effect on the regiochemical outcome of this reaction was observed by halide substituents in the olefin carbons, which may be utilized as an element of control of regioselectivity.
Regioselective Ring-Opening and Cross-Coupling Metathesis of 2-Substituted 7-Oxanorbornenes. New Stereoselective Entry into Trisubstituted Tetrahydrofurans
作者:Odón Arjona、Aurelio G. Csákÿ、M. Carmen Murcia、Joaquín Plumet