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
[EN] ANTI-COUNTERFEITING SECURITY INK ABSORBING RADIATIONS IN THE RANGE OF THE ELECTROMAGNETIC SPECTRUM FROM 700NM TO 1100NM<br/>[FR] ENCRE DE SÉCURITÉ ANTI-CONTREFAÇON ABSORBANT LES RAYONNEMENTS DANS LA PLAGE DU SPECTRE ÉLECTROMAGNÉTIQUE DE 700 NM À 1100 NM
申请人:EPTAINKS S P A
公开号:WO2020208498A1
公开(公告)日:2020-10-15
An anti-counterfeiting security ink for printing process having the viscosity less than 10,000 mPa∙s at 25°C absorbing radiation of at least a portion of the infrared region from 700 nm to 1100 nm revealable by photodetectors sensitive up to 1100 nm, comprising an IR absorbing inorganic material in a minimum quantity of 5% in weight and a particle size D50 less than 5.0 µm measured by laser diffraction technique, and an IR transparent organic matrix either a water-based or a solvent-based one, or it is alternatively based on monomer, oligomer, monomer and oligomer and at least one dissolved resin.
Kinetic resolution of 2-acylated-1,2-diols by lipase-catalyzed enantiomer selective acylation
作者:Gabriella Egri、Eszter Baitz-Gács、László Poppe
DOI:10.1016/0957-4166(96)00161-9
日期:1996.5
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