Asymmetric synthesis of dihydroquinolines by addition of organometallic reagents on a chiral 3-quinolinyl aminal was studied. 1,2-Adducts were obtained with good regio- and diastereoselectivity. The absolute configuration for 1,2-adducts was determined by X-ray analysis and for 1,4-adducts by chemical correlation. Asymmetric synthesis of dihydroquinolines by addition of organometallic reagents (RM) on a chiral 3-quinolinyl aminal was studied. 1,2-adducts were obtained with good regio- and diastereoselectivity.