Novel alpha,alpha-disubstituted epoxy esters were prepared in enantiopure form by hydrolytic kinetic resolution (HKR) of the corresponding racemic mixtures using chiral salenCo(III) as catalyst. The methodology provides a convenient route to enantioenriched beta,gamma-epoxy esters 2a, 2c and 2d. (C) 2010 Elsevier Ltd. All rights reserved.
Synthesis and biological evaluation of simplified mycothiazole analogues
Thiazoline and oxazoline analogues of the natural product mycothiazole were synthesized from a common intermediate and evaluated in vitro against HCT-15 colon cancer cells and L(4) larvae of nematode Nippostrongylus brasiliensis. The nature of the heterocyclic moiety seems to modulate the cytotoxic or anthelmintic activity.