15. Hai Zhou, Wen-Hu Wang, Yu Fu, Jian-Hua Xie, Wen-Jian Shi, Li-Xin Wang, and Qi-Lin Zhou*, Highly enantioselective copper-catalyzed conjugate addition of diethylzinc to enones using chiral spiro phosphoramidites as ligands, J. Org. Chem. 2003, 68, 1582-