with catecholborane, with α,β-unsaturatedketones in the presence of catalyst and triethylamine in proceeded with high enantioselectivity at 100 °C to give high yields of optically active β-alkenyl ketones of over 90% ee. Onepotsynthesis of the 1,4-addition product is also successful in the rhodium-catalyzed asymmetric reaction by use of alkenylboranes generated in situ from alkyne and catecholborane
A robust and stereocomplementary panel of ene-reductase variants for gram-scale asymmetric hydrogenation
作者:Nathalie Nett、Sabine Duewel、Luca Schmermund、Gerrit E. Benary、Kara Ranaghan、Adrian Mulholland、Diederik J. Opperman、Sabrina Hoebenreich
DOI:10.1016/j.mcat.2021.111404
日期:2021.2
engineered panel of ene-reductases (ERs) from Thermus scotoductus SA-01 (TsER) that combines control over facial selectivity in the reduction of electron deficient CC doublebonds with thermostability (up to 70 °C), organic solvent tolerance (up to 40 % v/v) and a broad substrate scope (23 compounds, three new to literature). Substrate acceptance and facial selectivity of 3-methylcyclohexenone was rationalized
我们报告了由Thermus scotoductus SA-01(TS ER)制成的烯化还原酶(ERs)工程组合,该组合将对面部选择性的控制与热稳定性(最高70°C),有机溶剂,减少电子缺陷性C C双键的还原相结合耐受性(最高40%v / v)和广泛的底物范围(23种化合物,三种是文献中的新化合物)。通过TS ER C25D / I67T的结晶和计算机对接,可以使3-甲基环己烯酮的底物接受度和面部选择性合理化。的TS ER变体面板显示出优异的对映体过量(EE)和产率在双相制备规模合成,具有高达93%的分离产率2 - [R,5S-二氢香芹酮(3.6g)。达到约40 000 h -1的周转频率(TOF),可与杂金属和均相金属催化的加氢速率相比。初步分批反应还证明了反应体系的可重复使用性,方法是依次除去有机相(正戊烷)以除去产物并用新鲜的底物代替。四个连续的批次产生约。来自45 mL水性反应的27
Biocatalytic access to nonracemic γ-oxo esters via stereoselective reduction using ene-reductases
作者:Nikolaus G. Turrini、Răzvan C. Cioc、Daan J. H. van der Niet、Eelco Ruijter、Romano V. A. Orru、Mélanie Hall、Kurt Faber
DOI:10.1039/c6gc02493a
日期:——
The asymmetric bioreduction of [small alpha],[small beta]-unsaturated [gamma]-keto esters usingene-reductasesfrom the OldYellowEnzymefamily proceeds with excellent stereoselectivity and high conversion levels, covering a broad range of acyclic and...
Directed Evolution of an Enantioselective Enoate-Reductase: Testing the Utility of Iterative Saturation Mutagenesis
作者:Despinaâ J. Bougioukou、Sabrina Kille、Andreas Taglieber、Manfredâ T. Reetz
DOI:10.1002/adsc.200900644
日期:2009.12
Directedevolution utilizing iterativesaturationmutagenesis (ISM) has been applied to the old yellow enzyme homologue YqjM in the quest to broaden its substrate scope, while controlling the enantioselectivity in the bioreduction of a set of substituted cyclopentenone and cyclohexenone derivatives. Guided by the known crystal structure of YqjM, 20 residues were selected as sites for saturation mutagenesis
esters and γ-lactams containing α,γ-stereogenic centers are widely used as chiral intermediates in various bioactive compounds, while their efficient synthesis remains a challenge. Herein, an enzymatic cascade reaction involving an ene reductase (ERED) and an imine reductase (IRED) for accessing to α,γ-stereospecific γ-amino esters and γ-lactams fromα,β-unsaturated γ-ketoesters has been developed
含有α,γ-立体中心的γ-氨基酯和γ-内酰胺被广泛用作各种生物活性化合物的手性中间体,而它们的有效合成仍然是一个挑战。本文开发了一种涉及烯还原酶 (ERED) 和亚胺还原酶 (IRED) 的酶级联反应,用于从 α,β-不饱和 γ-酮酯中获得 α,γ-立体特异性 γ-氨基酯和 γ-内酰胺。已鉴定出 21 个 ERED 和 13 个 IRED,分别对各种 α,β-不饱和 γ-酮酯和相应的手性 γ-酮酯具有高活性和立体选择性。通过采用合适的 ERED 和 IRED,(1 S ,3 S )、(1 S ,3 R )、(1 R ,3 S ) 和 (1 R,3 R ) 3-(环丙基氨基) 环己烷-1-羧酸甲酯的立体异构体作为单一立体异构体以 63–72% 的收率获得, (3 R ,5 R )- 和 (3 R ,5 S )-1 -环丙基-3,5-二甲基吡咯烷-2-一和1-环丙基-3,5-二丙基吡咯烷-2-