3-Hydroxyglutarate and β,γ-Epoxy Esters as Substrates for Pig Liver Esterase (PLE) and α-Chymotrypsin
作者:Peter Mohr、Lukas Rösslein、Christoph Tamm
DOI:10.1002/hlca.19870700118
日期:1987.2.4
The pH dependence of the α-chymotrypsin-catalyzedhydrolysis of dimethyl 3-hydroxyglutarate (3) has been studied. The e.e. was determined by HPLC analysis of diastereoisomeric camphanoic-acid derivatives. Kinetic resolution of the β,α-epoxy esters 10 and 24 by pig liver esterase has been shown to provide an alternative access to chiral β-hydroxy esters and acids of high optical purity. By this latter
Nitrile hydratase enzymes in organic synthesis: Enantioselective synthesis of the lactone moiety of the mevinic acids
作者:Samuel J. Maddrell、Nicholas J. Turner、Alison Kerridge、Andrew J. Willetts、John Crosby
DOI:10.1016/0040-4039(96)01259-2
日期:1996.8
(R)-4-Hydroxy-5-cyanopentene (−)-9, a known precursor of the protected lactonemoiety of the mevinicacids 1, has been prepared in 9 steps from (S)-3-(benzyloxy)-4-cyanobutanoic acid 5 (88% e.e.), which was obtained by the asymmetric 2 step hydrolysis of 3-benzyloxyglutaronitrile 4 involving the successive activity of a nitrile hydratase and an amidase enzyme.
Substitution dependent stereoselective construction of bicyclic lactones and its application to the total synthesis of pyranopyran, tetraketide and polyrhacitide A
作者:B. V. Subba Reddy、Dhanraj O. Biradar、Y. Vikram Reddy、J. S. Yadav、Kiran Kumar Singarapu、B. Sridhar
DOI:10.1039/c6ob01686c
日期:——
A novelbicyclization strategy has been developed for the stereoselective synthesis of bicycliclactones, i.e. 7-aryl or alkyl-2,6-dioxabicyclo[3.3.1]nonan-3-ones through a domino cyclization of (R)-3-hydroxyhex-5-enoic acid with an aldehyde in the presence of 10 mol% trimethylsilyltriflate under mild conditions. The salient features of this methodology are high yields, excellent selectivity, low catalyst
The present disclosure relates to the technical field of biochemical engineering and particularly discloses a preparation method for (R)-3-hydroxyl-5-hexenoate. In the method of the present disclosure, the (R)-3-hydroxyl-5-hexenoate is prepared by catalytic reduction of 3-carbonyl-5-hexenoate by ketoreductase with 3-carbonyl-5-hexenoate as the substrate. The amino acid sequence of ketoreductase is shown in SEQ ID NO.1. In the present disclosure, the (R)-3-hydroxyl-5-hexenoate having a very high chiral purity is obtained by asymmetric reduction by ketoreductase as the biocatalyst. The present disclosure has the advantages of easy operation, mild reaction conditions, high reaction yield and good practical industrial application value.
本公开涉及生物化学工程技术领域,特别涉及一种(R)-3-羟基-5-己烯酸的制备方法。在本公开的方法中,通过以3-羰基-5-己烯酸为底物,利用酮还酶催化还原3-羰基-5-己烯酸来制备(R)-3-羟基-5-己烯酸。酮还酶的氨基酸序列如SEQ ID NO.1所示。本公开通过以酮还酶为生物催化剂进行不对称还原,获得了具有非常高手性纯度的(R)-3-羟基-5-己烯酸。本公开具有操作简单、反应条件温和、反应产率高和实际工业应用价值好等优点。
((2S,4R)-4,6-DIHYDROXYTETRAHYDRO-2H-PYRAN-2-YL)METHYL CARBOXYLATE AND PROCESS FOR THE PRODUCTION THEREOF
申请人:Cluzeau Jerome
公开号:US20110046375A1
公开(公告)日:2011-02-24
The present invention relates to ((2S,4R)-4,6-dihydroxytetrahydro-2H-pyran-2-yl)methyl carboxylates and a process for the production thereof. Furthermore, the present invention relates to a process for the production of statins and in particular of Rosuvastatin and derivates thereof, wherein the above mentioned compounds are used as intermediates.