作者:Saverio Florio、Ludovico Ronzini、Erbana Epifani、Riccardo Sgarra
DOI:10.1016/s0040-4020(01)80568-8
日期:1993.1
1-Phenylsulfeny-4-penten-1-yne 1a, upon treatment with n-butyllithium, gave 2a that could be trapped with H2O, D2O and MeI leading regioselectively to the allene derivatives 3, 4 and 5 respectively. Also regioselective was the reaction of 2a with ketones furnishing very high yields of the allenic alcohols 6, 7 and 8. Similarly regioselective was the coupling of 2b with acetone affording allenic alcohol 18. Less regioselective were the reactions with aldehydes, leading to mixtures of allenic and propargylic alchools. Allenic alcohols 8 and 18 can be cyclized to dihydrofurans 19 and 20.