An Useful Synthetic Method for 3-Substituted δ-Lactones. Synthesis of (±)-Secocrispiolide
作者:Michiharu Kato、Akihiko Ouchi、Akira Yoshikoshi
DOI:10.1246/bcsj.64.1479
日期:1991.5
reactive Michael acceptor toward some typical carbon neucleophiles to give 3-substituted 2-phenylthio-5-pentanolides (2) which were convertible both to 3-substituted 5-pentanolides by reductive desulfurization and to 3-substituted 2-penten-5-olides by sulfenic acid syn elimination of the sulfoxides 4 derived from 2. The Pummerer rearrangement of 4 provided 3-substituted 2-phenylthio-2-penten-5-olides
THE MICHAEL REACTION OF 2-(PHENYLTHIO)-2-PENTEN-5-OLIDE WITH SOME BENZYLIC GRIGNARD REAGENTS. SYNTHESIS OF SECOCRISPIOLIDE
作者:Michiharu Kato、Akihiko Ouchi、Akira Yoshikoshi
DOI:10.1246/cl.1984.1697
日期:1984.10.5
The electrophilic reactivity of 2-(phenylthio)-2-penten-5-olide toward some benzylic Grignardreagents was investigated, and 2-methylene-3-(2,6-dimethylbenzyl)-5-pentanolide (secocrispiolide) was synthesized from one of the Michael adducts.
Synthesis of α-methylene-δ valerolactones and α-methylenecyclohexanones via radical cyclization of propiolates and acetylenic ketones
作者:Eun Lee、Chang Uk Hur、Cheol Min Park
DOI:10.1016/s0040-4039(00)97799-2
日期:1990.1
Synthesis of α-methylene-δ-valerolactones and α-methylenecyclohexanones is readily achieved via intramolecular radical cyclization of propiolates and acetylenicketones mediated by the addition of stannyl radicals.