Sequential synthesis of furans from alkynes: Successive ruthenium(II)- and copper(II)-catalyzed processes

Article abstract of DOI:10.1002/anie.200805531

(Chemical Equation Presented) Step in time: 2,5-Disubstituted furans can be prepared from terminal alkynes in one pot using two successive catalytic reactions (see scheme; p-TSA=para-toluene-sulfonic acid). First, a 1,3-dienyl alkyl ether is produced by t