Natural Products Total Synthesis
Targeted Application(s)/IndustryWe study for combinatorial synthesis of natural product analogues using solid-phase.
Progress on a total synthesis of the marine natural ..
Our research in the area of natural product synthesis has focused on the development of new synthetic strategies and methodologies for the construction of complex molecules possessing intriguing structural and biological properties. In addition to the total syntheses presented in this review, we also achieved the syntheses of a variety of biologically active natural products with structural challenges such as febrifugine,) viridiofungin A,) trachyspic acid,) cinatrin C1,) β-erythroidine,) NW-G01,) inthomycins A–C,) englerin A,) ophiodilactones A and B,) and marinomycin A.) The strategies and methodologies we have developed are of great potential value in synthetic organic chemistry as well as pharmaceutical research.
Whey Protein Concentrate is the product obtained by removal or separation of water, lactose and/or minerals from whey by ultra-filtration, dehydration or other process. Whey is an abundant source of branched chain amino acids (BCAA) which stimulate protein synthesis and it is easily absorbed, making it a good protein source.
reactions in the total syntheses of natural products ..
Kei Kitamura was born in Gifu in 1985 and graduated from Gakushuin University in 2008 under the direction of Prof. Takahiko Akiyama. He earned his Ph.D. degree in 2013 from the Tokyo Institute of Technology under the supervision of Prof. Keisuke Suzuki, where he worked on the total synthesis of pluramycin antibiotics. After postdoctoral work with Prof. Marcus A. Tius at the University of Hawaii, he was appointed as an assistant professor at Kwansei Gakuin University in the research group of Prof. Toshiyuki Hamura in 2015. His current research interests include the design and synthesis of highly ordered aromatic hydrocarbons for functional materials.
Diketopiperazine (DKP) motif is found in a wide range of biologically active natural products. This work details our efforts toward two classes of DKP-containing natural products.
in the total synthesis of biologically active natural products
Our basic idea to access compound 43 began with asymmetric epoxidation,) of σ-symmetrical dialkenylcarbinol 47 and then the sequence proceeded through Mitsunobu inversion, introduction of a nitrogen atom by taking advantage of the epoxy alcohol functionality, construction of a -unsaturated ester, and formation of both lactone and tetrahydropyran rings. Following this synthetic strategy, we achieved the first asymmetric total synthesis of (−)-dysiherbaine (37), thereby determining the absolute structure as illustrated in .)
Glutmate receptors mediate the majority of excitatory synaptic transmission in the central nervous system and are involved in numerous important physiological mechanisms such as memory, learning, and synaptic plasticity.) Importantly, excessive stimulation of these receptors is responsible for a variety of neurological disorders and neuronal damage from stroke.) Therefore, glutamate receptor agonists and antagonists with entirely novel structures are in high demand to probe the relationship between glutamate receptors and brain mechanisms and neuronal diseases. In addition, such antagonistic and agonistic compounds also provide useful lead compounds for drug discovery. In this context, we focused on the synthesis of dysiherbaine (37), neodysiherbaine A (38), and kaitocephalin (39). The total syntheses of dysiherbaine (37) and kaitocephalin (39) are presented here.
"Synthesis of natural products and small molecules …
Total Synthesis of Biologically Active Natural Products
Approaches to the total synthesis of biologically active natural products: studies directed towards bryostatins.
Fischer indole synthesis applied to the total synthesis …
Total Synthesis of Biologically Active Natural Products Based on Highly Selective Synthetic Methodologies ..
TOTAL SYNTHESIS OF BIOACTIVE NATURAL PRODUCTS
Isolation, Structure Elucidation, and Total Synthesis of Biologically Active Natural Products from Plants
Chemoenzymatic Synthesis Of Biologically Active Natural Products ..
Natural products that selectively interact with specific receptors and enzymes are of great importance as new drug leads or probes for exploring significant biological events. For the supply of such molecules, efficient total synthesis is required, especially when their availability from natural resources is low or ethically unsound. Natural products are not only valuable scaffolds for drug discovery but also challenging synthetic targets that provide an opportunity to develop new synthetic methods based on innovative, rational strategies. To achieve the synthesis of a target molecule, we often need to develop and optimize new methodology, which extends to more generalized synthetic methods beyond the specific setting of the natural product, and in this way total synthesis leads to the development of new chemistry. Our research therefore focuses on the development of new methodologies useful for the construction of complex molecules and the total synthesis of structurally and biologically intriguing natural products. This review presents our representative achievements from such synthetic efforts.
CHEMOENZYMATIC SYNTHESIS OF BIOLOGICALLY ACTIVE NATURAL PRODUCTS
Total syntheses of structurally and biologically intriguing natural products relying on new synthetic methodologies are described. This article features cinchona alkaloid-catalyzed asymmetric Morita–Baylis–Hillman reactions, heterocycle syntheses based on rhodium-catalyzed C–H amination and indium-catalyzed Conia-ene reactions, and their utilization for the syntheses of the phoslactomycin family of antibiotics, glutamate receptor agonists and antagonists, and alkaloids with characteristic highly substituted pyrrolidinone core structures.
Stereoselective Synthesis of Drugs and Natural Products
The Morita–Baylis–Hillman (MBH) reaction is essentially a three-component reaction involving the coupling of the α-position of an activated alkene such as acrylate with a carbon electrophile such as aldehyde under nucleophilic amine or phosphine catalysis and produces synthetically useful multifunctional products. When an imine is used as a carbon electrophile, the reaction is called the aza-MBH reaction (). The MBH reaction including the aza-version is regarded as one of the most promising carbon–carbon bond-forming reactions in terms of synthetic utility, atom economy, and operational simplicity. The growing importance of this reaction is evidenced by a quantum increase in the number of publications dealing with it during the past 15 years. However, the major problems associated with this reaction are its slow reaction rate and difficulty in achieving a high level of asymmetric induction.–)
Shodhganga@INFLIBNET: Stereoselective Total Synthesis …
We are developing efficient strategies for the synthesis of natural products with important biological activity. Targets include the microsclerodermin family of antifungal cyclic peptides. These marine natural products hold promise for the treatment of drug resistant pathogenic fungal infections that are a major problem for the growing number of AIDS and organ transplant patients who have compromised immune systems. Work to date has secured access to several of the unusual amino-acid building blocks required for the synthesis. Future work will explore strategies to unify these units and complete the synthesis. We are also pursuing an approach based on alkene-alkyne metathesis for the synthesis of the pyrrolo[2,1-c][1,4]benzodiazepine family of natural products typified by porothramycin A. Members of this family display potent in vitro and in vivo cytotoxicity, and have been observed to disrupt endonuclease activity and inhibit DNA transcription. We are also targeting non-natural analogues of the alkaloid methyllycaconitine, a neuronal nicotinic acetylcholine receptor antagonist, to elucidate their mode of action at nicotinic receptors. The development of the reactive modifications of these ligands can be used in combination with cysteine mutagenesis to help identify where these ligands bind in the receptor to exert their biological activity.
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