Copper(I) Alkoxide-Catalyzed Alkynylation of Trifluoromethyl Ketones
摘要:
A general method for direct alkynylation of trifluoromethyl ketones was developed by using (CuOBu)-Bu-t-xantphos or phenanthroline complexes as catalysts. The ligands significantly enhanced the catalyst activity. In addition, KOTf, generated in the catalyst preparation step, exhibited some acceleration effects. A preliminary extension to a catalytic enantioselective CF3-substituted tertiary propargyl alcohol synthesis (up to 52% ee) is also described.