Enantioselective Alkyne Addition to Aliphatic, Aromatic, and Vinyl Aldehydes Using Zn, <sup>i</sup>PrI, H<sub>8</sub>BINOL, and Ti(O<sup>i</sup>Pr)<sub>4</sub>
作者:Wen-Cai Huang、Winnie Liu、Xue-Dan Wu、Jun Ying、Lin Pu
DOI:10.1021/acs.joc.5b02185
日期:2015.11.20
A new catalytic system based on the readily available Zn, (PrI)-Pr-i, H8BINOL, and Ti((OPr)-Pr-i)(4) has been developed which avoids the use of pyrophoric ZnEt2. It can effectively catalyze the reaction of various terminal alkynes with aromatic, aliphatic, and vinyl aldehydes to generate chiral propargylic alcohols at room temperature with up to 98% yield and 98% enantiomeric excess. This new system signifciantly expands the substrate scope of the previously reported system using Zn, EtI, BINOL, and Ti((OPr)-Pr-i)(4).