Stereochemical Aspects of the “ tert-Amino Effect ” . 2 . Enantio-and Diastereoselectivity in the Synthesis of Quinolines , Pyrrolo [ l , 2-a ] quinolines , and

2.5-2.0 (m, 4 H, CH2), 2.31 (s, 3 H, CH3); 13C NMR 141.8 (s, C-9a), 139.0 and 133.4 (s, Ar C), 130.3,129.5, and 129.0 (d, Ar C), 119.3 (s, C-5a), 117.7 (d, Ar C), 114.3 and 112.5 (s, CN), 112.0 (d, Ar C), 72.1 (t, CH2OCH3), 64.0 [d, NCH (bridgehead)], 59.1 (q, OCH3), 57.1 and 53.2 [d, NCH(CH2OCH3) and ArCH(C6H4CH3)], 44.6 [s, C(CN)2], 28.0 and 26.9 (t, CH2), 21.2 (q, CH3); IR (KBr) 2260 (CN) cm"1; mass spectrum, m/e 357.189 (M+, caled 357.184). Anal. Caled for C23H23N30 (Mt 357.456): C, 77.28; H, 6.49; N, 11.75. Found: C, 76.91; H, 6.58; N, 11.71. X-ray Structure Determination of 6n. The crystal structure of 6n was determined by X-ray diffraction. Crystal data C18H21N30: triclinic, space group PI; a = 15.031 (1) Á, b = 8.190