The para -quinone methides ( p -QMs) are activated by Lewis acid and then attacked by diazo compounds. The following rearrangement leads to nitrogen gas extrusion and C–C double bond formation to constitute a metathesis reaction process. Therefore, the diazoester is transformed into tetrasubstituted alkenes, whereas the diazo-oxindole delivers the quinolinone products. Furthermore, the 13 C-labeling experiments were also conducted to elucidate a possible mechanism.
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Huang et al. (2016) studied this question.
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