Radical couplings of epoxides and nitriles mediated by Cp2TiCl provide a diastereoselective route to the synthesis of beta-hydroxyketones. The conditions of this "aldol-like" reaction are mild enough to avoid the dehydration of the beta-hydroxyketone. The scope of the coupling reaction with functionalized and tetrasubstituted epoxides has been studied. The radical character of the coupling reactions is demonstrated.
Buchta,E.; Andree,F., Justus Liebigs Annalen der Chemie, 1961, vol. 639, p. 9 - 24
作者:Buchta,E.、Andree,F.
DOI:——
日期:——
Radical Titanocene Promoted Coupling of Epoxides and Vinyl Sulfones
A radical coupling reaction of diverse vinylsulfones and epoxides was mediated by Cp2TiCl (Cp = cyclopentadienyl) to provide a straightforward synthetic pathway to hydroxy sulfones. The reaction was successfully achieved by using either an excess or a catalytic amount of the TiIII reagent. The scope of the reaction was studied for several different functionalized and substituted epoxides and vinyl