An efficient synthesis of mono- and bispropargylated tertiary amines is described. using the Nicholas reaction with primary and secondary amines as nucleophiles.
Chiral Phosphathiahelicenes: Improved Synthetic Approach and Uses in Enantioselective Gold(I)-Catalyzed [2 + 2] Cycloadditions of <i>N</i>-Homoallenyl Tryptamines
作者:Valentin Magné、Youssouf Sanogo、Charles S. Demmer、Pascal Retailleau、Angela Marinetti、Xavier Guinchard、Arnaud Voituriez
DOI:10.1021/acscatal.0c01819
日期:2020.8.7
A chiral phosphathiahelicene scaffold displaying a phosphole and a thiophene unit as the terminal rings of the helical sequence has been synthesized and characterized by spectroscopic methods and X-ray diffraction studies. The phosphine oxides (HelPhos-V oxides) have been obtained following a robust and scalable synthetic approach, based on a nickel-promoted alkyne cyclotrimerization reaction. Then