A direct and convenient approach for the coupling of propargylic substrates with diphenylphosphine oxide in the presence of Tf 2 O and 2,6-lutidine has been developed. The method provides a general approach for the construction of attractive allenylphosphoryl skeletons with high atom and step economy under metal free conditions.

A Co-catalyzed reductive cyclization of acrylate-containing 1,6-enynes is reported, providing an approach to construct five-membered carbocyclic and heterocyclic scaffolds containing enol ethers and all-carbon quaternary carbons. This novel process enables an E/Z mixture of 1,6-enynes to react with good functional group tolerance and good isolated yields, in an operationally simple manner.