Binaphthol-Derived Bisphosphoric Acids Serve as Efficient Organocatalysts for Highly Enantioselective 1,3-Dipolar Cycloaddition of Azomethine Ylides to Electron-Deficient Olefins
作者:Long He、Xiao-Hua Chen、De-Nan Wang、Shi-Wei Luo、Wen-Quan Zhang、Jie Yu、Lei Ren、Liu-Zhu Gong
DOI:10.1021/ja204218h
日期:2011.8.31
bifunctional chiral bisphosphoric acids through the formation of hydrogen bonds. The effect of the bisphosphoric acids on reactivity and stereochemistry of the three-component 1,3-dipolar cycloaddition reaction was also theoretically rationalized. The bisphosphoric acid catalyst 1a may take on a half-moon shape with the two phosphoric acid groups forming two intramolecular hydrogen bonds. In the case of maleates