Enantioselective transformation of propargyl esters to dihydrofurans
摘要:
Transformation of enantiomerically enriched propargyl esters 5 into dihydrofurans 6 with complete enantiospecificity is achieved by Ag(I)-catalyzed rearrangement and cyclization, and the sequence is successfully applied to the enantioselective synthesis of an antitumor protective and hypolipidemic antibiotic, (S)-(-)-ascofuranone.