Mechanism and Conditions for Highly Enantioselective Epoxidation of α,β-Enones Using Charge-Accelerated Catalysis by a Rigid Quaternary Ammonium Salt
作者:E. J. Corey、Fu-Yao Zhang
DOI:10.1021/ol990964z
日期:1999.10.1
[GRAPHICS]Highly enantioselective (up to 130:1) epoxidation of a variety of alpha,beta-enones to form alpha,beta-epoxy ketones is described along with a rational analysis of the mechanistic basis for this strong absolute stereochemical control by the chiral catalyst 2.
Antimalarial Cyclic Peroxy Ketals
作者:Gary H. Posner、Hardwin O'Dowd、Poonsakdi Ploypradith、Jared N. Cumming、Suji Xie、Theresa A. Shapiro
DOI:10.1021/jm980088f
日期:1998.6.1
Over 20 new, cyclic, peroxy ketals have been prepared via a two-step protocol starting with readily available aryl methyl ketones. Structure-activity correlations using in vitro antimalarial data as a guide for optimization of potency have led to the design and synthesis of seven new peroxides that have IC50 values of 31-85 nM (artemisinin IC50 = 8.4 nM). Some SAR generalizations are discussed.