<i>C</i><i><sub>2</sub></i>-Symmetric Tin(II) Complexes as Chiral Lewis Acids. Catalytic Enantioselective <i>Anti</i> Aldol Additions of Enolsilanes to Glyoxylate and Pyruvate Esters
作者:David A. Evans、David W. C. MacMillan、Kevin R. Campos
DOI:10.1021/ja972547s
日期:1997.11.1
important role in the design of Sn(II)-based chiral Lewisacidiccomplexes. Specifically, the Lewisacidiccomplexes 1 and 2 derived from Sn(OTf)2 and bidentate bis(oxazoline)4 and tridentate pyridylbis(oxazoline)5 ligands6 are efficient anti-aldol catalysts for the enantioselective addition of enolsilanes to 1,2-dicarbonyl compounds. These ligand-metal complexes exhibit efficient turnover in the catalytic