Enantioselective metal carbene transformations with polyethylene-bound soluble recoverable dirhodium(II) 2-pyrrolidone-5(S)-carboxylates
摘要:
Ligand displacement of methyl 2-pyrrolidone-5(S)-carboxylate (5(S)-MEPYH) from Rh2-(5(S)-MEPY)4 by a soluble polyethylene-bound 2-pyrrolidone-5(S)-carboxylate produced a recoverable dirhodium(II) catalyst whose effectiveness was demonstrated by high enantioselection for intramolecular cyclo-propanation of 3-methyl-2-buten-1-yl diazoacetate (98% ee) and intramolecular C-H insertion of 2-methoxyethyl diazoacetate (72% ee) as well as by catalyst recovery and reuse seven times.