合成 de l'acide (hydroxy-3methyl-4methylamino-2) octene-6oique apr aldolisation entre l'enolate de la (benzyl-4 isothiocyanatoacetyl-3) oxazolidone-2 et des alcenals
Total syntheses of close analogues of the immunosuppressant FK506
作者:Mark J Batchelor、Roger J Gillespie、Julian MC Golec、Charles JR Hedgecock、Stuart D Jones、Robert Murdoch
DOI:10.1016/s0040-4020(01)80796-1
日期:1994.1
The totalsynthesis of an analogue of FK506, in which the substituted cyclohexyl residue at C28 has been replaced by a phenyl group, is described. This synthesis demonstrates (i) the successful application of new methodology for the introduction of the masked tricarbonyl grouping (C8-C10), and (ii) new synthetic routes to the (C10-C19) and (C22-C26) regions.
Preparative-Scale, Facile Synthesis of (2<i>R</i>,4<i>E</i>)-2-Methyl-4-hexenal: A Key Intermediate of (2<i>S</i>,3<i>R</i>,4<i>R</i>,6<i>E</i>)-3-Hydroxy-4-methyl-2-methylamino-6-octenoic Acid (MeBmt)
作者:Donald T. Deyo、Johannes D. Aebi、Daniel H. Rich
DOI:10.1055/s-1988-27650
日期:——
Facile separation and mild acidic hydrolysis of the diastereomeric amides derived from 2-methyl-4-hexenoic acid and L-2-phenylglycinol are used in a rapid, preparative-scale synthesis of (2R,4E)-2-methyl-4-hexenal, a key intermediate of MeBmt.
Lipase-catalyzed resolution of racemic 2-alkyl substituted 1-alkanols
作者:Stefan Barth、Franz Effenberger
DOI:10.1016/s0957-4166(00)80120-2
日期:1993.5
(R)-2-alkyl-1-alkanols (R)-1 with high optical purities were obtained by lipase-catalyzed esterification of the racemic substrates (R,S)-1 with vinyl acetate in dichloromethane. The alcohols (R)-1 were oxidized without racemization to the corresponding carboxylic acids (R)-4. The enriched (S)-acetates (S)-3 either were saponified to the alcohols (S)-1 which are substrates for a second lipase-catalyzed transesterification to give (S)-1 in high optical purity or were racemized and applied once again in the kinetic resolution to prepare (R)-1.
A stereospecific synthesis of (4R)-4-[(E)-2-butenyl]-4, N-dimethyl-L-threonine (MeBmt)