Unusual Regioselectivity in the Aldehyde Addition Reactions of Allenyl/Propargyl Zirconium Complexes Derived from γ-(2-Pyridyl)propargyl Ethers: Synthesis of Multisubstituted α-Hydroxyallenes
作者:Guoqin Fan、Xin Xie、Yuanhong Liu、Yuxue Li
DOI:10.1021/om301007z
日期:2013.3.25
different to that of the reactions using propargylic ethers without a pyridyl group reported so far, in which homopropargyl alcohols were formed predominantly. The structure of allenylzirconium intermediate has been confirmed by X-ray crystal analysis which reveals an intramolecular Zr–N coordination. DFT calculations suggest that the smaller steric effect of the pyridine ring compared with the phenyl