An unusual reaction of cyclic enol ethers with titanium(III) tetrahydroborate
摘要:
Titanium(III) Tetrahydroborate formed in situ from titanium tetrachloride and benzyltrieihylammonium retrahydroborate (1:4) readily reacts with cyclic enol ethers in dichloromethane at -20 degrees C to give the corresponding acyclic diols in high yields after simple aqueous work-up. (C) 1997 Elsevier Science Ltd.
Benzyltriethylammoniumborohydride-chlorotrimethylsilane reagent system has been found to effect a novel and unusual reaction with cyclic and cyclic enol ethers 1 to give exclusively diols and alcohols 2 respectively in high yields, under very mild reaction conditions.