Zn(OTf)2 catalyzed addition–cyclization reaction of allenylphosphine oxides with propargyl alcohol-unexpected formation of 2,5-dimethylenetetrahydrofurans and 2-substituted furans
摘要:
A novel synthesis of 2,5-dimethylenetetrahydrofurans, 2-substituted furans and a beta,omega-diketophosphonate in good to excellent yields has been achieved by the reaction of allenylphosphine oxides/allenylphosphonate with propargyl alcohol using zinc triflate/triethylamine combination. (C) 2011 Elsevier Ltd. All rights reserved.