7339-87-9Relevant academic research and scientific papers
Oxidation of L-Tyrosine by Vanadium (V) in Presence of Sulphuric Acid
Sharma, Vijai K.,Sharma, K.,Payasi, Angad P.
, p. 1041 - 1046 (1986)
Oxidation of L-tyrosine with vanadium (V) in sulphuric acid medium at constant ionic strength is first order in oxidant and H+.The order in tyrosine varies from 1 to 0.A mechanism consistent with the kinetic results is proposed in which the rate determining step is the decomposition of the complex formed in the prior equilibrium. - Keywords: Mechanism; Oxidation; Tyrosine
An enzymatic, stereoselective synthesis of (S)-norcoclaurine
Bonamore, Alessandra,Rovardi, Irene,Gasparrini, Francesco,Baiocco, Paola,Barba, Marco,Molinaro, Carmela,Botta, Bruno,Boffi, Alberto,MacOne, Alberto
, p. 1623 - 1627 (2010)
An efficient, stereoselective, green synthesis of (S)-norcoclaurine (higenamine) has been developed using the recombinant (S)-norcoclaurine synthase (NCS) enzyme, starting from the cheap tyrosine and dopamine substrates in a one-pot, two step process. Key steps in the biotransformation consist of the oxidative decarboxylation of tyrosine by stoichiometric amounts of sodium hypochlorite in order to generate 4-hydroxyphenylacetadehyde, followed by the addition of enzyme and dopamine substrate in the presence of ascorbate, a necessary ingredient in order to avoid oxidation of the catechol moiety. Quantitative extraction of the product from an aqueous solution was achieved by adsorption onto active charcoal dispersed in the reaction mixture. The optimized process afforded enantiomerically pure (S)-norcoclaurine (93%) in a yield higher than 80% and allowed good recovery of the enzyme for recycling. The process thus developed represents the first example of a green Pictet-Spengler synthesis, which may pave the way to novel strategies in benzylisoquinoline alkaloid synthesis.
Small-molecular boron drug and application thereof
-
Paragraph 0020-0025, (2021/07/24)
The invention discloses a small-molecular boron drug. The small-molecular boron drug has a structure as shown in a formula I that is described in the specification. In the formula I, R is any one selected from the group consisting of ortho-carborane, meta
Biomimetic synthesis and anti-inflammatory effects of horsfiequinone A
Wang, Mei,Liu, Yuan-Lie,Li, Dashan,Xiao, Wen-Wen,Chen, Yang,Zhang, Hong-Lin,Zhan, Rui,Shao, Li-Dong
, (2021/02/05)
Inspired by the oxy-tyrosinase type II copper enzyme, a biomimetic synthesis of the natural product horsfiequinone A (1) has been achieved using CuOTf/DBED/O2 catalyzed oxidation as a key step. The synthetic route furnished 1 in 33% overall yield (64% brsm) from commercially available para-hydroxybenzaldehyde. Moreover, revisiting the biological activity of 1 resulted in the discovery of its in vitro inhibitory activity towards nitric oxide (NO) production in LPS-induced RAW264.7 cells with an IC50 value of 4.42 ± 0.81 μM. The anti-inflammatory effect of 1 was further supported by an iNOS expression inhibition assay and molecular docking simulation.
Rapid biosynthesis of phenolic glycosides and their derivatives from biomass-derived hydroxycinnamates
Zhao, Mingtao,Hong, Xulin,Abdullah,Yao, Ruilian,Xiao, Yi
, p. 838 - 847 (2021/02/09)
Biomass-derived hydroxycinnamates (mainly includingp-coumaric acid and ferulic acid), which are natural sources of aromatic compounds, are highly underutilized resources. There is a need to upgrade them to make them economically feasible. Value-added phenolic glycosides and their derivatives, both belonging to a class of plant aromatic natural products, are widely used in the nutraceutical, pharmaceutical, and cosmetic industries. However, their complex aromatic structures make their efficient biosynthesis a challenging process. To overcome this issue, we created three novel synthetic cascades for the biosynthesis of phenolic glycosides (gastrodin, arbutin, and salidroside) and their derivatives (hydroquinone, tyrosol, hydroxytyrosol, and homovanillyl alcohol) fromp-coumaric acid and ferulic acid. Moreover, because the biomass-derived hydroxycinnamates directly provided aromatic units, the cascades enabled efficient biosynthesis. We achieved substantially high production rates (up to or above 100-fold enhancement) relative to the glucose-based biosynthesis. Given the ubiquity of the aromatic structure in natural products, the use of biomass-derived aromatics should facilitate the rapid biosynthesis of numerous aromatic natural products.
Efficient Synthesis of Phenylacetate and 2-Phenylethanol by Modular Cascade Biocatalysis
Mao, Zuoxi,Liu, Lijun,Zhang, Yang,Yuan, Jifeng
, p. 2676 - 2679 (2020/06/03)
The green and sustainable synthesis of chemicals from renewable feedstocks by a biotransformation approach has gained increasing attention in recent years. In this work, we developed enzymatic cascades to efficiently convert l-phenylalanine into 2-phenylethanol (2-PE) and phenylacetic acid (PAA), l-tyrosine into tyrosol (p-hydroxyphenylethanol, p-HPE) and p-hydroxyphenylacetic acid (p-HPAA). The enzymatic cascade was cast into an aromatic aldehyde formation module, followed by an aldehyde reduction module, or aldehyde oxidation module, to achieve one-pot biotransformation by using recombinant Escherichia coli. Biotransformation of 50 mM l-Phe produced 6.76 g/L PAA with more than 99 % conversion and 5.95 g/L of 2-PE with 97 % conversion. The bioconversion efficiencies of p-HPAA and p-HPE from l-Tyr reached to 88 and 94 %, respectively. In addition, m-fluoro-phenylalanine was further employed as an unnatural aromatic amino acid substrate to obtain m-fluoro-phenylacetic acid; '96 % conversion was achieved. Our results thus demonstrated high-yielding and potential industrial synthesis of above aromatic compounds by one-pot cascade biocatalysis.
Transaminase-Catalyzed Continuous Synthesis of Biogenic Aldehydes
Contente, Martina L.,Paradisi, Francesca
, p. 2830 - 2833 (2019/08/12)
The physiological role of biogenic aldehydes, such as 3,4-dihydroxyphenylacetaldehyde (DOPAL), has been associated with cardiovascular and neurodegenerative disorders. The availability of these substrates is limited and robust synthetic methodologies would greatly facilitate further biological studies. Herein, a transaminase-mediated single-step process in continuous mode, which leads to excellent product yields (90–95 %), is reported. Coimmobilization of the pyridoxal phosphate (PLP) cofactor eliminated the need for exogenous addition of this reagent without affecting the longevity of the system, delivering a truly self-sufficient process.
Design and Use of de novo Cascades for the Biosynthesis of New Benzylisoquinoline Alkaloids
Wang, Yu,Tappertzhofen, Nadine,Méndez-Sánchez, Daniel,Bawn, Maria,Lyu, Boyu,Ward, John M.,Hailes, Helen C.
supporting information, p. 10120 - 10125 (2019/06/27)
The benzylisoquinoline alkaloids (BIAs) are an important group of secondary metabolites from higher plants and have been reported to show significant biological activities. The production of BIAs through synthetic biology approaches provides a higher-yielding strategy than traditional synthetic methods or isolation from plant material. However, the reconstruction of BIA pathways in microorganisms by combining heterologous enzymes can also give access to BIAs through cascade reactions. Most importantly, non-natural BIAs can be generated through such artificial pathways. In the current study, we describe the use of tyrosinases and decarboxylases and combine these with a transaminase enzyme and norcoclaurine synthase for the efficient synthesis of several BIAs, including six non-natural alkaloids, in cascades from l-tyrosine and analogues.
MASP-2 INHIBITORS AND METHODS OF USE
-
Paragraph 2124-2125, (2019/12/24)
The present disclosure provides, inter alia, compounds with MASP-2 inhibitory activity, compositions of such compounds and methods of making and using such compounds.
Selective oxidation of aliphatic C-H bonds in alkylphenols by a chemomimetic biocatalytic system
Du, Lei,Dong, Sheng,Zhang, Xingwang,Jiang, Chengying,Chen, Jingfei,Yao, Lishan,Wang, Xiao,Wan, Xiaobo,Liu, Xi,Wangi, Xinquan,Huang, Shaohua,Cui, Qiu,Feng, Yingang,Liu, Shuang-Jiang,Li, Shengying
, p. E5129 - E5137 (2017/07/04)
Selective oxidation of aliphatic C-H bonds in alkylphenols serves significant roles not only in generation of functionalized intermediates that can be used to synthesize diverse downstream chemical products, but also in biological degradation of these environmentally hazardous compounds. Chemo-, regio-, and stereoselectivity; controllability; and environmental impact represent the major challenges for chemical oxidation of alkylphenols. Here, we report the development of a unique chemomimetic biocatalytic system originated from the Gram-positive bacterium Corynebacterium glutamicum. The system consisting of CreHI (for installation of a phosphate directing/ anchoring group), CreJEF/CreG/CreC (for oxidation of alkylphenols), and CreD (for directing/anchoring group offloading) is able to selectively oxidize the aliphatic C-H bonds of p-And m-Alkylated phenols in a controllable manner. Moreover, the crystal structures of the central P450 biocatalyst CreJ in complex with two representative substrates provide significant structural insights into its substrate flexibility and reaction selectivity.
