Catalytic Asymmetrization of cis-2-Cyclopentene-1,4-diol. Highly Efficient and Practical Synthesis of (R)-4-Benzoyloxy-2-cyclopenten-1-one
摘要:
Highly efficient, direct, and practical synthesis of (R)-4-benzoyloxy-2-cyclopenten-1-one, a chiral building block for various prostaglandins, with excellent ee was performed by the catalytic asymmetric acylation of cis-2-cyclopentene-1,4-diol, followed by oxidation with PDC.
Palladium-Catalyzed Chemo- and Enantioselective Oxidation of Allylic Esters and Carbonates
作者:Barry M. Trost、Jeffery Richardson、Kelvin Yong
DOI:10.1021/ja057163d
日期:2006.3.1
oxidation of allylic esters and carbonates using a novel potassium nitronate has been developed. This method is highly chemoselective, leaving other esters, alcohols, thioethers, and amines undisturbed. The oxidation can be operated in two modes: an achiral mode, using either PPh3 or rac-2 as ligand, or a chiral and highly enantioselective mode, using 2 as ligand. The oxidative enantioselective desymmetrization