M. Oestreich et D. Hoppe, (-)-sparteine-mediated stereoselective intramolecular conjugate addition reactions of dienes and enynes, TETRAHEDR L, 40(10), 1999, pp. 1881-1884
Enantioenriched carbanionic pairs generated by the asymmetric deprotonation
of carbamate eaters with the chiral base s-butyllithium/(-)-sparteine unde
rgo smoothly intramolecular conjugate addition reactions to dienes and enyn
es in high yields. (C) 1999 Elsevier Science Ltd. All rights reserved.