[EN] PROTEIN TYROSINE PHOSPHATASE INHIBITORS AND METHODS OF USE THEREOF [FR] INHIBITEURS DE PROTÉINE TYROSINE PHOSPHATASE ET LEURS MÉTHODES D'UTILISATION
ether-oxygen to the stereogenic quaternary carbon center of the oxirane ring had a profound influence on the enantioselectivity, and several oxiranes were resolved with good to excellent selectivities. The enantiomerically enriched epoxides and vicinal diols thus obtained contain a useful “synthetic handle” in their side chain, which allows their use as buildingblocks in asymmetric synthesis.
Pigments of fungi, part 16. Synthesis of methyl (R)-(+)-tetrahydro-2-methyl-5-oxo-2-furanacetate and its (S)-(−)-antipode, chiroptical references for determination of the absolute stereochemistry of fungal pre-anthraquinones.
作者:Melvyn Gill、Albin F. Smrdel
DOI:10.1016/s0957-4166(00)86350-8
日期:1990.1
The (R)- and (S)-butanolides 7 and 9 are synthesized via asymmetric epoxidation from geraniol; the (R)-butanolide 7 is also obtained from (S)- citramalic acid. The butanolides 7 and 9 are valuable reference compounds for the determination of absolute stereochemistry in fungal and plant pre-anthraquinones.
Facile Synthesis of Optically Active Tertiary Alcohol Building Blocks by Stereospecific C–H Insertion Reaction of Dichlorocarbene with Secondary Alcohol Derivatives
作者:Yukio Masaki、Hideki Arasaki、Motoo Shiro
DOI:10.1246/cl.2000.1180
日期:2000.10
Stereospecific C–H insertion of dichlorocarbene generated from a system CHCl3/50%NaOH/cetyltrimethylammonium chloride (as a PTC) proceeded at the carbinol carbon in the reaction of chiral secondary alcohol derivatives to provide α-dichloromethylated tertiary alcohol derivatives with complete retention of configuration.
AN ASYMMETRIC SYNTHESIS OF β-FORMYL β-HYDROXY ESTERS
作者:Yoji Sakito、Masatoshi Asami、Teruaki Mukaiyama
DOI:10.1246/cl.1980.455
日期:1980.4.5
Optically active β-formyl β-hydroxy esters are prepared in high enantiomeric excess by treating 2-acyl-1,3-diazabicyclo[3.3.0]octane derivatives, prepared from (S)-2-(substituted aminomethyl)pyrrolidine and phenylglyoxal monohydrate or methyl hydroxymethoxyacetate, with metal enolates of ethyl acetate.
Totalsynthese von nat�rlichem ?-Tocopherol. 4. Mitteilung. Aufbau des Chromanringsystems aus Trimethylhydrochinon und einem optisch aktiven C4- bzw. C5-Synthon