A convergent route to dihydrobenzofuran neolignans via a formal 1,3-cycloaddition to oxidized phenols
摘要:
Oxidation of p-methoxy-substituted phenols with iodobenzene bis-trifluoroacetate in the presence of electron-rich styrene derivatives affords trans-dihydrobenzofurans stereoselectively.
A convergent route to dihydrobenzofuran neolignans via a formal 1,3-cycloaddition to oxidized phenols
摘要:
Oxidation of p-methoxy-substituted phenols with iodobenzene bis-trifluoroacetate in the presence of electron-rich styrene derivatives affords trans-dihydrobenzofurans stereoselectively.
Claisen rearrangement (CR) of resorcinol allyl ethers was examined. Although thermal CR gave low regioselectivity, the selectivity was much improved in the presence of a Lewis acid such as borontrichloride. This rearrangement was successfully applied to resorcinol carvonyl ethers for the regioselective introduction of a carvone unit into the resorcinol skeleton for the synthesis of phytoestrogenic