La (OTf)3: An efficient catalyst for green synthesis of bis (Indolyl)methanesunder solvent free conditions

An efficient, mild and inexpensive La(OTf)3 catalyst was used for the synthesis of bis(indolyl) methane derivatives from indole and aromatic aldehydes under microwave irradiation. The yield of product formation using such process afforded excellent yields as compare to conventional method. We believed the methodology is simple, high yielding and environmentally friendly