1, 4-Addition of Terminal Alkynes to Conjugated Enones in Water Using Green Catalyst Bis[(L)prolinato-N,O]Zn-An Environmentally Benign Protocol

An easy, low cost, and green procedure is proposed for the 1, 4-addition of terminal alkynes to conjugated enones in water as a sole medium using easily accessible Zn[(L)Proline](2). This protocol has advantages of high yield, mild reaction conditions, no environmental pollution and simple work up procedure.