Enantioselective synthesis of 2,2-difluoro-3-hydroxycarboxylates by rhodium-catalyzed hydrogenation
摘要:
The highly enantioselective synthesis of 2,2-difluoro-3 -hydroxycarboxylates has been achieved by hydrogenating 2,2-difluoro-3-oxocarboxylates in the presence of chiral rhodium-(amidephosphine-phosphinite) complexes. Ethyl 4,4,4-triffluoroacetoacetate can be successfully transformed into the enantiomerically enriched 4,4,4-trifluoro-3-hydroxybutanoate in the same manner. (C) 2000 Elsevier Science Ltd. All rights reserved.
Autoinducer compounds which enhance gene expression in a wide variety of microorganisms, therapeutic compositions and therapeutic methods wherein gene expression within microorganisms is regulated are disclosed.