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An attractive method for the synthesis of indoline-7-carboxylates through RhCl-catalyzed C-H carbonylation of indolines with CO and alcohols was developed. The copper-based oxidant and removable pyrimidyl directing group played important roles in achieving high-level yields of the title products. Based on control experiments, a possible catalytic cycle was proposed.
PMID: 31368713 [PubMed - as supplied by publisher]