- Cyclic (Alkyl)(amino)carbene Ligand-Promoted Nitro Deoxygenative Hydroboration with Chromium Catalysis: Scope, Mechanism, and Applications
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Transition metal catalysis that utilizes N-heterocyclic carbenes as noninnocent ligands in promoting transformations has not been well studied. We report here a cyclic (alkyl)(amino)carbene (CAAC) ligand-promoted nitro deoxygenative hydroboration with cost-effective chromium catalysis. Using 1 mol % of CAAC-Cr precatalyst, the addition of HBpin to nitro scaffolds leads to deoxygenation, allowing for the retention of various reducible functionalities and the compatibility of sensitive groups toward hydroboration, thereby providing a mild, chemoselective, and facile strategy to form anilines, as well as heteroaryl and aliphatic amine derivatives, with broad scope and particularly high turnover numbers (up to 1.8 × 106). Mechanistic studies, based on theoretical calculations, indicate that the CAAC ligand plays an important role in promoting polarity reversal of hydride of HBpin; it serves as an H-shuttle to facilitate deoxygenative hydroboration. The preparation of several commercially available pharmaceuticals by means of this strategy highlights its potential application in medicinal chemistry.
- Zhao, Lixing,Hu, Chenyang,Cong, Xuefeng,Deng, Gongda,Liu, Liu Leo,Luo, Meiming,Zeng, Xiaoming
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supporting information
p. 1618 - 1629
(2021/01/25)
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- Discovery of a Potent Glutathione Peroxidase 4 Inhibitor as a Selective Ferroptosis Inducer
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Potent and selective ferroptosis regulators promote an intensive understanding of the regulation and mechanisms underlying ferroptosis, which is highly associated with various diseases. In this study, through a stepwise structure optimization, a potent and selective ferroptosis inducer was developed targeting to inhibit glutathione peroxidase 4 (GPX4), and the structure-activity relationship (SAR) of these compounds was uncovered. Compound26aexhibited outstanding GPX4 inhibitory activity with a percent inhibition up to 71.7% at 1.0 μM compared to 45.9% of RSL-3. At the cellular level,26acould significantly induce lipid peroxide (LPO) increase and effectively induce ferroptosis with satisfactory selectivity (the value of 31.5). The morphological analysis confirmed the ferroptosis induced by26a. Furthermore,26asignificantly restrained tumor growth in a mouse 4T1 xenograft model without obvious toxicity.
- Xu, Congjun,Xiao, Zhanghong,Wang, Jing,Lai, Hualu,Zhang, Tao,Guan, Zilin,Xia, Meng,Chen, Meixu,Ren, Lingling,He, Yuanfeng,Gao, Yuqi,Zhao, Chunshun
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p. 13312 - 13326
(2021/09/28)
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- Method for preparing amine through catalytic reduction of nitro compound by cyclic (alkyl) (amino) carbene chromium complex
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The cyclic (alkyl) (amino) carbene chromium complex is prepared from corresponding ligand salt, alkali and CrCl3 and used for catalyzing pinacol borane to reduce nitro compounds in an ether solvent under mild conditions to generate corresponding amine. The method for preparing amine has the advantages of cheap and accessible raw materials, mild reaction conditions, wide substrate application range, high selectivity and the like, and is simple to operate.
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Paragraph 0015
(2021/04/17)
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- Charge Transport and Quantum Interference Effects in Oxazole-Terminated Conjugated Oligomers
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Charge transport in single molecule junctions critically depends on the chemical identity of anchor groups used to connect molecular wires to electrodes. In this work, we report the charge transport properties of conjugated oligomers with oxazole anchors,
- Li, Songsong,Yu, Hao,Schwieter, Kenneth,Chen, Kejia,Li, Bo,Liu, Yun,Moore, Jeffrey S.,Schroeder, Charles M.
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supporting information
p. 16079 - 16084
(2019/10/21)
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- HETEROARYL RHEB INHIBITORS AND USES THEREOF
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The present invention provides compounds, compositions thereof, and methods of using the same. Compositions comprising a compound of this invention or a pharmaceutically acceptable derivative thereof and a pharmaceutically acceptable carrier, adjuvant, or vehicle. The amount of the compound in compositions of this invention is such that it is effective to measurably inhibit Rheb, in a biological sample or in a patient.
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Paragraph 00516
(2018/11/10)
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- Synthesis of 2-TIPS-oxazol-5-ylboronic acid pinacol ester: efficient route to 5-(het)aryloxazoles via Suzuki cross-coupling reaction
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A facile synthetic route to the new 2-TIPS-oxazol-5-ylboronic acid pinacol ester was described herein. Its reactivity toward Suzuki cross-coupling reaction was studied to provide various 5-(het)aryloxazoles. A wide range of functions on the aryl moiety ar
- Primas, Nicolas,Bouillon, Alexandre,Lancelot, Jean-Charles,Rault, Sylvain
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experimental part
p. 6348 - 6353
(2009/12/04)
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- ANTIFUNGAL AGENTS
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Compounds of formula (I), and pharmaceutically acceptable salts thereof, may be used in therapy, for example as antifungal agents: (I) wherein: Rl, R2, R3, R4, R5, R6, R7, X and X1 are as defined herein. Certain compounds of formula (I) are also provided. Compounds of formula (T), and agriculturally acceptable salts thereof, may also be used as agricultural fungicides.
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Page/Page column 66-67
(2008/06/13)
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- HYDRAZONE DERIVATIVE
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A compound represented by the following formula (I): wherein R1 represents hydrogen, aryl which may have a substituent, a saturated or unsaturated 5- to 7-membered heterocyclic group which may have a substituent, etc.; R2 represents hydrogen, aryl which may have a substituent, a saturated or unsaturated 5- to 7-membered heterocyclic group which may have a substituent, etc.; R3 represents hydrogen, etc.; Ar represents a divalent group derived from aromatic hydrocarbon, etc.; X represents a single bond, linear or branched alkylene having from 1 to 3 carbon atoms which may have a substituent, etc.; and G represents halogen, a saturated or unsaturated 5- or 6-membered cyclic hydrocarbon group which may have a substituent, a saturated or unsaturated 5- to 7-membered heterocyclic group which may have a substituent, etc., a salt thereof or a solvate thereof; and an agent for inhibiting aggregation and/or deposition of an amyloid protein or an amyloid-like protein, which comprises the compound, a salt thereof or a solvate thereof
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Page/Page column 20
(2010/11/08)
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- Pyrimidines and uses thereof
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The invention relates to pyrimidines and uses thereof, including to inhibit lysophosphatidic acid acyltransferase β (LPAAT-β) activity and/or proliferation of cells such as tumor-cells.
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- Inhibitors of inosine monophosphate dehydrogenase: SARs about the N-[3-methoxy-4-(5-oxazolyl)phenyl moiety
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The first reported structure-activity relationships (SARs) about the N-[3-methoxy-4-(5-oxazolyl)phenyl moiety for a series of recently disclosed inosine monophosphate dehydrogenase (IMPDH) inhibitors are described. The syntheses and in vitro inhibitory values for IMPDH II, and T-cell proliferation (for select analogues) are given.
- Iwanowicz, Edwin J.,Watterson, Scott H.,Guo, Junqing,Pitts, William J.,Murali Dhar,Shen, Zhongqi,Chen, Ping,Gu, Henry H.,Fleener, Catherine A.,Rouleau, Katherine A.,Cheney, Daniel L.,Townsend, Robert M.,Hollenbaugh, Diane L.
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p. 2059 - 2063
(2007/10/03)
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- NOVEL AMIDE COMPOUNDS
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A compound of the formula (I):R1-A-X-NHCO-Y-R2 ???whereinR1 is heterocyclic group which may have suitable substituents, or phenyl which may have suitable substituents,R2 is condensed phenyl which may have suitable substituents, phenyl which may have suitable substituents, or thienyl which may have suitable substituents,A is a group of the formula:-(CH2)t-(O)m- or in which R3 and R4 are each hydrogen or linked together to form imino,R5 is hydrogen or lower alkyl,t is 0, 1 or 2,p, m and n are each 0 or 1,X is phenylene which may have suitable substituents, or bivalent heterocyclic group containing nitrogen which may have suitable substituents,Y is bond, lower alkylene, or lower alkenylene, and a salt thereof.
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- Inhibitors of IMPDH enzyme
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The present invention relates to a novel class of compounds which are IMPDH inhibitors. This invention also relates to pharmaceutical compositions comprising these compounds. The compounds and pharmaceutical compositions of this invention are particularly well suited for inhibiting IMPDH enzyme activity and consequently, may be advantageously used as therapeutic agents for IMPDH mediated processes. This invention also relates to methods for inhibiting the activity of IMPDH using the compounds of this invention and related compounds.
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Page column 17-18
(2010/02/04)
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