2- (PHENYLTHIO)-2-PENTEN-5-OLIDE, A NEW BUILDING BLOCK FOR THE SYNTHESIS OF 3-SUBSTITUTED δ-LACTONES
作者:Michiharu Kato、Akihiko Ouchi、Akira Yoshikoshi
DOI:10.1246/cl.1983.1511
日期:1983.10.5
2- (Phenylthio)-2-penten-5-olide, readily accessible from δ-valelolactone, showed high electrophilic reactivities toward some typical carbon nucleophiles to give 3-substituted 2-(phenylthio)pentanolides, which were convertible to a variety of 3-substituted pentan-5-olides and 2-penten-5-olides.
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