A new cyclisation procedure to prepare 4-carboxy-quinolin-2-ones via a one-pot Cu(II)-mediated radical cross-dehydrogenative coupling/sulfinic acid elimination of linear anilides is described. Extensions to more complex substrates are also reported as are applications in target synthesis allowing access to natural products isolated from Oryza sativa and HOFQ.
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- Cross-dehydrogenative coupling
- Total synthesis