The free-radical addition of thiophenol to bornylene and apobornylene: structures of product sulphides and sulphones formed on oxidation
作者:D. I. Davies、P. J. Rowley
DOI:10.1039/j39680001832
日期:——
The free-radicaladdition of thiophenol to bornylene affords phenyl isobornyl sulphide and phenyl epi-isobornyl sulphide, the products of exo radical attack. Oxidation converts these sulphides into the corresponding exo-sulphones, which on treatment with potassium t-butoxide in t-butyl alcohol are epimerized to give the corresponding endo-sulphones, phenyl bornyl sulphone, and phenyl epibornyl sulphone
(Et(2)N)(2)PCl. Two applications of these compounds to synthetic asymmetric organophosphorus chemistry have been examined: their reactions with 2,3,3-trimethylbutene and AlCl(3) afford either P-chiral phosphetane oxides or, in the presence of gaseous HCl, P-chiral phosphinic chlorides with moderate to high diastereoselectivity.