Diastereoselective HOTf-catalyzed three-component one-pot 1,3-dipolar cycloaddition of alpha-diazo ester, nitrosobenzene and electron-deficient alkene.

Diastereoselective HOTf-catalyzed three-component one-pot 1,3-dipolar cycloaddition of alpha-diazo ester, nitrosobenzene and electron-deficient alkene.