Synthesis of new C2-symmetric bis(β-hydroxy amide) ligands and their applications in the enantioselective addition of alkynylzinc to aldehydes
作者:Xin-Ping Hui、Chao Yin、Zhi-Ce Chen、Lu-Ning Huang、Peng-Fei Xu、Gui-Fang Fan
DOI:10.1016/j.tet.2008.01.036
日期:2008.3
chiral C2-symmetric bis(β-hydroxy amide) ligands was synthesized via the reaction of isophthaloyl dichloride and aminoalcohols derived from l-amino acid. The titanium(IV) complex of C2-symmetric chiral ligand 3b was effective for the asymmetric alkynylation of aldehydes and the propargyl alcohols were obtained in high yields (up to 94%) and high enantiomeric excesses (up to 98%) under optimized conditions