Substrate Evaluation of<i>Rhodococcus erythropolis</i>SET1, a Nitrile Hydrolysing Bacterium, Demonstrating Dual Activity Strongly Dependent on Nitrile Sub-Structure
作者:Tracey M. Coady、Lee V. Coffey、Catherine O'Reilly、Claire M. Lennon
DOI:10.1002/ejoc.201403201
日期:2015.2
Rhodococcus erythropolis SET1, a novel nitrilehydrolysing bacterial isolate, has been undertaken with 34 nitriles, 33 chiral and 1 prochiral. These substrates consist primarily of β-hydroxy nitriles with varying alkyl and aryl groups at the β position and containing in several compounds different substituents α to the nitrile. In the case of β-hydroxy nitriles without substitution at the α position
Enantioselective Synthesis of Cyclic, Quaternary Oxonitriles
作者:Yakup Güneş、M. Fatih Polat、Ertan Sahin、Fraser F. Fleming、Ramazan Altundas
DOI:10.1021/jo1011202
日期:2010.11.5
Quaternaryoxonitriles are stereoselectively generated from the union of five-, six-, and seven-membered 2-chloroalkenecarbonitriles with chiral alcohols via a Claisen rearrangement. The strategy rests on a new conjugate addition−elimination of allylic alkoxides to 2-chlorocycloalkenecarbonitriles to afford substituted 2-alkoxyalkenenitriles. Subsequent thermolysis unmasks a cyclicoxonitrile while
Method of producing hexamethylene diamine from butadiene
申请人:Degussa AG
公开号:US20030212298A1
公开(公告)日:2003-11-13
The invention relates to the production of hexamethylene diamine from butadiene. The method comprises the successively performed stages of: (i) a catalytic epoxidation of butadiene to 1,2-epoxy-3-butene; (ii) a basically catalyzed addition of hydrogen cyanide to butadiene monoxide to form a reaction mixture containing 3-hydroxy-4-pentene nitrile (3HPN) and 2-hydroxymethyl-3-butene nitrile (2HMBN); (iii) an acidically catalyzed dehydration of the cyanohydrines 3HPN and 2HMBN of stage (ii) to cis/trans-pentadiene nitrile (PDN); (iv) a basically catalyzed addition of the products of stage (iii) to form cis/trans-1,4-dicyanobutene-1 and -2 (DCB); and (v) a catalytic hydrogenation of the isomeric cis/trans-1,4-dicyanobutene of stage (iv) to hexamethylene diamine.
Enantioselective Ring Opening of Epoxides with Cyanide Catalysed by Halohydrin Dehalogenases: A New Approach to Non-Racemic β-Hydroxy Nitriles
作者:Maja Majerić Elenkov、Bernhard Hauer、Dick B. Janssen
DOI:10.1002/adsc.200505333
日期:2006.3
Halohydrindehalogenases (HheA, HheB and HheC) were found to efficiently catalyse a carbon-carbon bond forming reaction between terminal aliphatic epoxides and cyanide, yielding β-hydroxynitriles. With all three enzymes nucleophilic ringopening of epoxides proceeds with high regioselectivity to the β-carbon atom. Activity, enantioselectivity and enantiopreference depend on the type of enzyme and
Degradation of 2-hydroxybut-3-enylglucosinolate (progoitrin)
作者:Alexander J. Macleod、John T. Rossiter
DOI:10.1016/s0031-9422(00)84763-9
日期:1987.1
Abstract Using a model system consisting of synthesized 2-hydroxybut-3-enylglucosinolate and a purified thioglucoside glucohydrolase preparation from Brassica napus , the effects of ascorbate, of Fe 2+ and of Cu 2+ were examined on the extent and course of glucosinolate degradation. Ascorbate was found to promote thioglucosidase activity to a considerable extent over the whole of the wide range of