Synthetic and kinetic studies of substituent effects in the furan intramolecular Diels-Alder reaction
作者:Brian J. McNelis、Daniel D. Sternbach、Andrew T. MacPhail
DOI:10.1016/s0040-4020(01)81331-4
日期:1994.1
The IntramolecularDiels-Alderreactions (IMDA) of a series of 2-sulfone substituted 1-furyl-4-penten-1-ols, 5a-c, have been studied. As the steric demands of the alkyl group on the sulfone was increased the rate and product yields in the IMDA reaction have also been observed to increase. The kinetics of these systems have been studied in detail as well as solvent effects to quantify substituent group
Preparation and reactions of 1-(5-X-2-furyl)-2-methylsulfonyl-2-furoyl or -2-thienylethylenes with nucleophilic reagents are described. Stereochemistry of selected compounds was studied by NMR spectroscopy.
A facile and efficient method for constructing 2,3-diacyl trisubstituted furans via a silver-mediated radical process of β-ketosulfones is developed. The reaction mechanism has been carefully investigated, revealing that the transformation proceeds through a radical pathway, leading to moderate to good yields of desired products.
synthesis and conformationalanalysis of some β-thioderivatives of 1-(2'-furyl)ethanol and their -methyl derivatives, Ar-CHX-CH2-Y (X: OH and OMe; Y: SMe, SOMe and SO2Me), are reported. The conformational equilibria have been established from 1H-nmr data and high dilution ir studies. Immunosuppressive properties of (methylsulphinyl)methyl 2-furyl ketone and 2-(methylsulphinyl)-1-(2'-furyl)ethanol, (RR/SS)