inherent double controlled strategy of sterically hindered propargyl alcohols without the installing of external directing groups. Its synthetic robustness and practicality have been illustrated by the concise synthesis of bervastatin, a hypolipidemic drug, and late‐stage modification of complex alkynes with precise regioselectivity.
The design of a spiro-pyrrolidine organocatalyst and its application to catalytic asymmetric Michael addition for the construction of all-carbon quaternary centers
A novel chiral spiro-pyrrolidine silyether organocatalyst has been designed. Its catalyticasymmetric effect is demonstrated by the Michaeladdition reaction, which affords the desired products with an all-carbon quaternarycenter...
gold-catalyzed tandem hydration/α-ketol rearrangement of 1-alkynylcyclobutanol derivatives, leading to cyclopentanones bearing an α-hydroxy substituted quaternary center. In the presence of water, coordination of gold catalyst onto alkynyl moiety triggers hydration rather than a direct ringexpansion, which followed by unprecedented Au-catalyzed α-ketol rearrangement. The details and the scope of this method
Catalytic asymmetric formal synthesis of (−)‐cephalotaxine has been accomplished based on an efficient tandem intramolecular hydroamination/asymmetricsemipinacolrearrangement reaction catalyzed by chiral silver phosphate. During the course of the study it was observed that an advanced intermediate could be obtained in enantiopure form by enantiomer separation on silica gel.