Highly Enantioselective Catalytic Alkyl Propiolate Addition to Aliphatic Aldehydes
作者:Mark Turlington、Albert M. DeBerardinis、Lin Pu
DOI:10.1021/ol900667g
日期:2009.6.4
A novel H8BINOL-based chiral ligand (S)-3 is found to catalyze the alkyl propiolate addition to aliphatic aldehydes in the presence of ZnEt2 and Ti(OiPr)4 at room temperature with excellent enantioselectivity (89−97% ee).
发现一种新型的基于H 8 BINOL的手性配体(S)-3在室温下在ZnEt 2和Ti(O i Pr)4的存在下以优异的对映选择性(89-97%)催化丙酸烷基酯加成到脂肪族醛中ee)。
3,3′-Anisyl-Substituted BINOL, H<sub>4</sub>BINOL, and H<sub>8</sub>BINOL Ligands: Asymmetric Synthesis of Diverse Propargylic Alcohols and Their Ring-Closing Metathesis to Chiral Cycloalkenes
作者:Yang Yue、Mark Turlington、Xiao-Qi Yu、Lin Pu
DOI:10.1021/jo9018446
日期:2009.11.20
aldehydes. It catalyzed the reactions of alkyl propiolates with 88−99% ee; the reactions of phenylacetylene with 81−87% ee; the reactions of 4-phenyl-1-butyne, an alkyl alkyne, with 77−89% ee; and the reactions of trimethylsilylacetylene with 92−97% ee. The optically active propargylic alcohols generated from this catalytic asymmetric alkyne addition were observed to undergo efficient ring-closing-metathesis