“…Meanwhile, the Yang group reported a CuBr-catalyzed selective synthesis of cyclohexanone-fused pyrroles through the substituent-controlled cyclization of O -acyl oximes with cyclic 1,3-diones . Besides, other transition metal catalysts including Au, Pd, Ag, Rh, and Ru have also been employed in pyrrole synthesis. Although these advances are useful, large amounts of solvents, external heating, long reaction time, and/or highly functionalized starting materials are often required, which will limit the practicability of these methods.…”