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Synthesis of indoxylic acid esters by rhodium-catalyzed carbene n-h insertion and thermal cyclization
Reaction between diethyl diazomalonate and a range of N-alkylanilines in the presence of a catalytic amount of rhodium(ii) acetate dimer afforded carbene N-H insertion to produce anilinomalonates in modest-to-good yields. Upon heating to a high temperature for a short time, the anilinomalonates underwent thermal cyclization to indoxylic acid esters.
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Reference£º
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem