Reactions of vinyl sulfone with α-diazo-β-ketosulfone and Bestmann–Ohira reagent for the regioselective synthesis of highly functionalized pyrazoles
作者:Rahul Kumar、Deepa Nair、Irishi N.N. Namboothiri
DOI:10.1016/j.tet.2014.01.022
日期:2014.3
The 1,3-dipolarcycloaddition of diazomethylsulfone anion, generated in situ from α-diazo-β-ketosulfone, with vinyl sulfone proceeds in a regioselective manner to provide sulfonylpyrazoles. Similar reaction of diazomethylphosphonate anion, derived from Bestmann–Ohira reagent, with vinyl sulfone leads to phosphonylpyrazoles. The sulfonyl group of vinyl sulfone undergoes chemoselective elimination in
Dry Reaction Under Microwave: Condensation of Sulfones with Aldehydes on KF-Alumina
作者:Didier Villemin、Abdelkrim Ben Alloum
DOI:10.1080/00397919108020790
日期:1991.1
Ethyl phenylsulfonylacetate(1), phenylsulfonylacetonitrile(2) and phenylsulfonylacetophenone (3) were condensated with aldehydes (a-d) into unsaturated sulfone without solvent in the presence of KF on alumina under microwave irradiation.