Synthetic cascades are enabled by combining biocatalysts with artificial metalloenzymes
作者:V. Köhler、Y. M. Wilson、M. Dürrenberger、D. Ghislieri、E. Churakova、T. Quinto、L. Knörr、D. Häussinger、F. Hollmann、N. J. Turner、T. R. Ward
DOI:10.1038/nchem.1498
日期:2013.2
within a host protein affords an artificial transfer hydrogenase (ATHase) that is fully compatible with and complementary to natural enzymes, thus enabling efficient concurrent tandem catalysis. To illustrate the generality of the approach, the ATHase was combined with various NADH-, FAD- and haem-dependent enzymes, resulting in orthogonal redox cascades. Up to three enzymes were integrated in the cascade
酶催化和均相催化提供互补的方法来应对化学和生物学中的合成挑战。尽管具有吸引力,但由于两种催化剂的相互失活,将有机金属催化剂与酶结合的并发级联反应的实施已被证明具有挑战性。为了解决这个问题,我们表明结合 a d 6宿主蛋白质中的钢琴粪便复合物提供了一种与天然酶完全兼容和互补的人工转移氢化酶 (ATHase),从而实现高效的并发串联催化。为了说明该方法的通用性,将 ATHase 与各种 NADH、FAD 和血红素依赖性酶结合,产生正交氧化还原级联反应。多达三种酶被整合到级联中并与 ATHase 结合,以实现 (i) 双立体选择性胺去消旋,(ii) 辣根过氧化物酶偶联的转移氢化酶活性读数,以实现其遗传优化,(iii)从L形成L-哌啶酸-赖氨酸和 (iv) NADH 的再生以促进单加氧酶催化的氧化功能化反应。
P-Trifluoromethyl ligands derived from Josiphos in the Ir-catalysed hydrogenation of 3,4-dihydroisoquinoline hydrochlorides
作者:R. Schwenk、A. Togni
DOI:10.1039/c5dt02019k
日期:——
Ferrocenyl phosphines containing a stereogenic P-CF3 group show improved selectivities in the Ir-catalysed hydrogenation of dihydroisoquinolinium derivatives.
含有手性P-CF3基团的二茂铁磷化物在铱催化的二氢异喹啉衍生物加氢反应中显示出改善的选择性。
Electrochemical Synthesis of Hindered Primary and Secondary Amines via Proton-Coupled Electron Transfer
作者:Dan Lehnherr、Yu-hong Lam、Michael C. Nicastri、Jinchu Liu、Justin A. Newman、Erik L. Regalado、Daniel A. DiRocco、Tomislav Rovis
DOI:10.1021/jacs.9b10870
日期:2020.1.8
Accessing hindered amines, particularly primary amines α to a fully substituted carbon center, is synthetically challenging. We report an electrochemical method to access such hindered amines starting from benchtop-stable iminium salts and cyanoheteroarenes. A wide variety of substituted heterocycles (pyridine, pyrimidine, pyrazine, purine, azaindole) can be utilized in the cross-coupling reaction
Stereoselectivity and Structural Characterization of an Imine Reductase (IRED) from <i>Amycolatopsis orientalis</i>
作者:Godwin A. Aleku、Henry Man、Scott P. France、Friedemann Leipold、Shahed Hussain、Laura Toca-Gonzalez、Rebecca Marchington、Sam Hart、Johan P. Turkenburg、Gideon Grogan、Nicholas J. Turner
DOI:10.1021/acscatal.6b00782
日期:2016.6.3
The imine reductase AoIRED from Amycolatopsis orientalis (Uniprot R4SNK4) catalyzes the NADPH-dependent reduction of a wide range of prochiral imines and iminiumions, predominantly with (S)-selectivity and with ee’s of up to >99%. AoIRED displays up to 100-fold greater catalytic efficiency for 2-methyl-1-pyrroline (2MPN) compared to other IREDs, such as the enzyme from Streptomyces sp. GF3546, which
Polycyclic ring-fused 2-pyridones (5a-e and 9a-e) have been prepared via a microwave-assisted acyl-ketene imine cyclocondensation. Starting from 3,4-dihydroisoquinolines (4a-b) or 3,4-dihydroharman (8), fused 2-pyridones could be prepared in a one-step procedure. By using either Meldrum's acid derivatives (1a-d) or 1,3-dioxine-4-ones (7a-b) as acyl-ketene sources, mono- or disubstitution of the fused