A Regioselective Route to 5-Substituted Isoxazole- and Isoxazoline-3-phosphonates
作者:Paola Conti、Andrea Pinto、Lucia Tamborini、Petra Dunkel、Veniero Gambaro、Giacomo Visconti、Carlo De Micheli
DOI:10.1055/s-0028-1083343
日期:2009.2
5-Substituted 3-(diethoxyphosphoryl)isoxazoles and -2-isoxazolines were synthesized regioselectively by 1,3-dipolarcycloaddition of (diethoxyphosphoryl)formonitrile oxide to monosubstituted alkynes and alkenes. By applying this methodology to an N-(tert-butoxycarbonyl)-substituted allylglycine methyl ester, we prepared the precursors of two diastereomeric 3-phosphono-2-isoxazolin-5-yl-substituted