sulfides and β-hydroxyl nitriles by ring opening of epoxides with aromatic, aliphatic, and heterocyclic thiols and trimethylsilyl cyanide at room temperature under solvent free conditions. All the reactions proceeded satisfactorily in short times and afforded the corresponding products in good to excellent yields with high regioselectivity and chemoselectivity under mild reaction conditions.
AN ALDOL-TYPE REACTION OF ACETONITRILES USING DIALKYLBORYL TRIFLATE
作者:Hiroshi Hamana、Tsutomu Sugasawa
DOI:10.1246/cl.1982.1401
日期:1982.9.5
Acetonitriles and benzaldehydes react in the presence of dialkyl boryl triflate and diisopropylethylamine in dichloromethane to give the corresponding aldol-type products in good yields under mild conditions.
Nucleic acid fragments encoding nitrile hydratase and amidase enzymes from comamonas testosteroni 5-MGAM-4D and recombinant organisms expressing those enzymes useful for the production of amides and acids
申请人:——
公开号:US20040225116A1
公开(公告)日:2004-11-11
The invention relates to the isolation, sequencing, and recombinant expression of genes encoding either a nitrile hydratase (NHase) or amidase (Am) from
Comamonas testosteroni
5-MGAM-4D, where the NHase is useful for catalyzing the hydration of certain nitriles to the corresponding amides, and the amidase is useful for hydrolysis of certain amides to the corresponding carboxylic acids. Also provided are transformed host cells containing polynucleotides for expressing the nitrile hydratase or amidase enzymes from
Comamonas testosteroni
5-MGAM-4D.
Biocatalytic and Structural Properties of a Highly Engineered Halohydrin Dehalogenase
作者:Marcus Schallmey、Robert J. Floor、Bernhard Hauer、Michael Breuer、Peter A. Jekel、Hein J. Wijma、Bauke W. Dijkstra、Dick B. Janssen
DOI:10.1002/cbic.201300005
日期:2013.5.10
Synergistic mutations: A halohydrindehalogenase with 37 mutations and improved catalytic properties for statin side chain synthesis has been biochemically characterized. Crystal structures with different ligands in the active site give insight into the way in which individual mutations contribute to enhanced stability and faster cyanolysis of epoxides and illustrate the importance of synergistic mutations
[EN] METHOD FOR THE PREPARATION OF 3-SUBSTITUTED-3'-HYDROXYPROPIONITRILE<br/>[FR] PROCEDE PREPARATION DE 3'-HYDROXYPROPIONITRILE SUBSTITUE EN 3
申请人:RSTECH CORP
公开号:WO2005087715A1
公开(公告)日:2005-09-22
The present invention relates to a method for the preparation of 3-substituted-3’-hydroxypropionitrile, more particularly, to a method for the preparation of 3-substituted-3’-hydroxypropionitrile which comprises performing ring opening of 1-substituted-ethylene oxide using sodium cyanide and citric acid in a range of pH 7.8 ~ 8.3 to provide 3-substituted-3’-hydroxypropionitrile in high optical purity and with high yield.