Kinetic resolution of 2-acylated-1,2-diols by lipase-catalyzed enantiomer selective acylation
摘要:
Enantiomer selectivity of lipase catalyzed acylation of 2-acylated 1,2-diols was studied. First, acylation of 2-acetoxyheptan-1-ol rac-3b with vinyl acetate was investigated by varying the enzyme and the solvent, showing the highest enantiomer selectivity by using lipase from Pseudomonas fluorescens (PfL) in hexane-vinyl acetate (VA). We have found varying or even reversed enantiomer selectivity for different secondary acyl moieties in 2-acyloxyheptan-1-ols rac-3bA-F. Next, all six possible types of enantiomer selective biotransformations (hydrolysis of diacetate and the two kinds of monoacetetes; acylation of diol and the two kinds of monoacetates) were compared on two model diols rac-4b,d. Among the transformations investigated, acetylation of secondary monoacetates rac-3b,d showed the highest enantiomer selectivity. Finally, PfL catalyzed acetylations of several 2-acetylated 1,2-diols rac-3a-g were investigated under our optimum conditions. Copyright (C) 1996 Elsevier Science Ltd
Kinetic resolution of 2-acylated-1,2-diols by lipase-catalyzed enantiomer selective acylation
摘要:
Enantiomer selectivity of lipase catalyzed acylation of 2-acylated 1,2-diols was studied. First, acylation of 2-acetoxyheptan-1-ol rac-3b with vinyl acetate was investigated by varying the enzyme and the solvent, showing the highest enantiomer selectivity by using lipase from Pseudomonas fluorescens (PfL) in hexane-vinyl acetate (VA). We have found varying or even reversed enantiomer selectivity for different secondary acyl moieties in 2-acyloxyheptan-1-ols rac-3bA-F. Next, all six possible types of enantiomer selective biotransformations (hydrolysis of diacetate and the two kinds of monoacetetes; acylation of diol and the two kinds of monoacetates) were compared on two model diols rac-4b,d. Among the transformations investigated, acetylation of secondary monoacetates rac-3b,d showed the highest enantiomer selectivity. Finally, PfL catalyzed acetylations of several 2-acetylated 1,2-diols rac-3a-g were investigated under our optimum conditions. Copyright (C) 1996 Elsevier Science Ltd
A novel and highly efficient procedure for insideselective esterification of terminal vic-diols has been achieved in one-pot via Yb(OTf)3-catalyzed formation and partial hydrolysis of cyclic orthoesters. This method offers several advantages including wide compatibility with acid labile functional groups, and good to high regioselectivity and yields.
Universal support media for synthesis of oligomeric compounds
申请人:——
公开号:US20040242897A1
公开(公告)日:2004-12-02
Compounds for the synthesis of oligomeric compounds, particularly oligonucleotides and oligonucleotide mimetics, are provided. In addition, methods for functionalizing a support medium with a first monomeric subunit and methods for the synthesis of oligomeric compounds utilizing the novel compounds bound to support media are provided.
[EN] UNIVERSAL SUPPORT MEDIA FOR SYNTHESIS OF OLIGOMERIC COMPOUNDS<br/>[FR] SUBSTRAT DE SUPPORT UNIVERSEL UTILISE POUR LA SYNTHESE DE COMPOSES OLIGOMERES
申请人:ISIS PHARMACEUTICALS INC
公开号:WO2004011474A1
公开(公告)日:2004-02-05
Compounds for the synthesis of oligomeric compounds, particularly oligonucleotide and oligonucleotide mimetics, are provided. In addition, methods for functionalizing a support medium with a first monomeric subunit and methods for the synthesis of oligomeric compounds utilizing the novel compounds bound to support media are provided.