An organometallic route to (±)3-p-toluenesulfinyl- 2-pyrone
作者:Gary H. Posner、Wayne Harrison
DOI:10.1016/0022-328x(85)87397-6
日期:1985.4
3-Bromo-2-pyrone reacts with dimethylcopperlithium and then with p-tolyl p-toluenethiosulfonate to form 3-p-toluenethio-2-pyrone. Organocopper species are likely intermediates in this reaction. Oxidation of the sulfide produces (±)-3-p-toluenesulfinyl-2-pyrone. The overall process involves an important and useful umpolung, a reversal of reactivity at C(3) of the pyrone ring from an electrophilic center