Reductive Cyclization of Ester-Containing Enynes with a Practical Titanocene Reagent. Synthesis of Bicyclic Cyclopentenones and Iminocyclopentenes

Article abstract of DOI:10.1021/jo00048a001

The combination of Cp2TiCl2 with 2 equiv of EtMgBr provides an effective reagent for the reductive cyclization of enynes, including ester-containing enynes, to bicyclic titanacyclopentenes.These metallacycles may then be transformed into bicyclic cyclopen