Rhodium(iii)-catalyzed oxidative cross-coupling of benzoxazinones with styrenes via C–H activation

Abstract

Vinylarenes represent an important class of core skeleton embedded in natural products, organic materials, and pharmaceutical molecules. Therefore, numerous efforts have been devoted to developing efficient methods for their preparation....

Synthesis of spiropyrans via Ru(ii)-catalyzed coupling of 3-aryl-2H-benzo[b][1,4]oxazines with benzoquinones

“…Based on the above observations and reported literature precedents, 13 a plausible mechanism for the spiroannulations of benzoxazine 1a and benzoquinones/ N -sulfonyl quinone monoimines 2 was proposed, as shown in Scheme 5. Cyclometalation of 1a affords the five-membered ruthenium( ii ) intermediate A .…”