RHODIUM-CATALYZED CYCLOISOMERIZATION OF ALLYL PROPARGYL ETHERS:AN EFFICIENT SYNTHESIS OF 3,4-DISUBSTITUTED FURANS

摘要

Cycloisomerization of allyl propargyl ethers was found to be catalyzed by a cationic rhodium complex to give 3,4-disubstituted furans in one step.Addition of carboxylic acids to the reaction improved the yield of the products.Generation of a rhodium hydride species from a rhodium complex with the carboxylic acids followed by hydrorhodation of the substrate with the rhodium hydride species would be involved in the reaction pathway.