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.
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.
Structure−Activity Relationships for Inhibition of Inosine Monophosphate Dehydrogenase by Nuclear Variants of Mycophenolic Acid
作者:Peter H. Nelson、Stephen F. Carr、Bruce H. Devens、Elsie M. Eugui、Fidencio Franco、Carlos Gonzalez、Ronald C. Hawley、David G. Loughhead、David J. Milan、Eva Papp、John W. Patterson、Sussan Rouhafza、Eric B. Sjogren、David B. Smith、Rebecca A. Stephenson、Francisco X. Talamas、Ann-Marie Waltos、Robert J. Weikert、John C. Wu
DOI:10.1021/jm9603633
日期:1996.1.1
Structure-activity relationships in the region of the phthalide ring of the inosine monophosphate dehydrogenase inhibitor mycophenolic acid have been explored. Replacement of the lactone ring with other cyclic moieties resulted in loss of potency, especially for larger groups. Replacement of the ring by acyclic substituents also indicated a strong sensitivity to steric bulk. A phenolic hydroxyl group, with an adjacent hydrogen bond acceptor, was found to be essential for high potency. The aromatic methyl group was essential for activity; the methoxyl group could be replaced by ethyl to give a compound with 2-4 times the potency of mycophenolic acid in vitro and in vivo.
KATO, MICHIHARU;OUCHI, AKIHIKO;YOSHIKOSHI, AKIRA, BULL. CHEM. SOC. JAP., 64,(1991) N, C. 1479-1486