Highly efficient and regioselective platinum(II)-catalyzed tandem synthesis of multiply substituted indolines and tetrahydroquinolines.

A special advantage: The platinum(II)-catalyzed tandem cyclization of aminoalkynes with 1,3-diketones offers a new and highly efficient method for the synthesis of indolines and tetrahydroquinolines (see scheme; M.S. = molecular sieves). This transformation affords good to excellent product yields with high regio- and chemoselectivity under mild reaction conditions.