The asymmetricepoxidation of electron‐deficient olefins has been achieved using inexpensive and readily available prolinols as catalysts with good to excellent yields and enantioselectivities. The utility of the resulting chiral epoxides was illustrated by elaboration to several synthetically useful compounds featuring a concise synthesis of (−)‐(5R,6S)‐balasubramide.
The first catalytic enantioselectiveFriedel–Craftsalkylation of indoles with α,β-unsaturated trifluoromethyl ketones has been accomplished. The reaction was achieved in the presence of the Dy(OTf)3/Pybox complex, producing the desired products in high yields (up to 99%) with good enantioselectivities (up to 86% ee). The absolute stereochemistry of the resulting adducts was determined by X-ray analysis
Pyrazoline derivatives, their preparation and application as medicaments
申请人:Laboratorios del Dr. Esteve, S.A.
公开号:US06353117B1
公开(公告)日:2002-03-05
The present invention relates to new pyazoline derivatives of formula
and to physiologically acceptable salts thereof, to the method for their preparation and to their application as medicaments.