Cu(II)-Mediated aerobic oxidative synthesis of sulfonated chromeno[4,3-c]pyrazol-4(2H)-ones

Photo-induced aerobic cross-coupling of quinoxalin-2(1H)-ones with electron-rich thiophenes

Herein, an economical and efficient protocol was developed for the aerobic oxidative cross-coupling of electron-rich thiophenes and quinoxazolines with the activation of two C-H bonds. No external photosensitizer was necessary for constructing the thiophenyl-quinoxazoline backbone. The substrate scope demonstrated the good functional tolerance of quinoxalin-2(1H)-ones, and suitable thiophenes for this coupling fall within the special spectrum of oxidative potentials lower than +1.50 V vs. SCE.

Cu(II)-catalyzed synthesis of N-sulfonated quinolin-2(1H)-one-3-carboxamides

Herein, N-N bond cleavage of sulfonylhydrazides was observed and applied in the synthesis of N-sulfonated quinolin-2-(1H)-one-3-carboxamides. More than 30 examples were forged in 52%-97% yields. Further transformation delivered a 3,4-dihydro-quinolin-2(1H)-one derivative.