- Targeting Chikungunya Virus Replication by Benzoannulene Inhibitors
-
A benzo[6]annulene, 4-(tert-butyl)-N-(3-methoxy-5,6,7,8-tetrahydronaphthalen-2-yl) benzamide (1a), was identified as an inhibitor against Chikungunya virus (CHIKV) with antiviral activity EC90 = 1.45 μM and viral titer reduction (VTR) of 2.5 log at 10 μM
- Ahmed, S. Kaleem,Haese, Nicole N.,Cowan, Jaden T.,Pathak, Vibha,Moukha-Chafiq, Omar,Smith, Valerie J.,Rodzinak, Kevin J.,Ahmad, Fahim,Zhang, Sixue,Bonin, Kiley M.,Streblow, Aaron D.,Streblow, Cassilyn E.,Kreklywich, Craig N.,Morrison, Clayton,Sarkar, Sanjay,Moorman, Nathaniel,Sander, Wes,Allen, Robbie,Defilippis, Victor,Tekwani, Babu L.,Wu, Mousheng,Hirsch, Alec J.,Smith, Jessica L.,Tower, Nichole A.,Rasmussen, Lynn,Bostwick, Robert,Maddry, Joseph A.,Ananthan, Subramaniam,Gerdes, John M,Augelli-Szafran, Corinne E.,Suto, Mark J.,Morrison, Thomas E.,Heise, Mark T.,Streblow, Daniel N.,Pathak, Ashish K.
-
-
Read Online
- Catalyst-Free Decarbonylative Trifluoromethylthiolation Enabled by Electron Donor-Acceptor Complex Photoactivation
-
A catalyst- and additive-free decarbonylative trifluoromethylthiolation of aldehyde feedstocks has been developed. This operationally simple, scalable, and open-to-air transformation is driven by the selective photoexcitation of electron donor-acceptor (EDA) complexes, stemming from the association of 1,4-dihydropyridines (donor) with N-(trifluoromethylthio)phthalimide (acceptor), to trigger intermolecular single-electron transfer events under ambient- and visible light-promoted conditions. Extension to other electron acceptors enables the synthesis of thiocyanates and thioesters, as well as the difunctionalization of [1.1.1]propellane. The mechanistic intricacies of this photochemical paradigm are elucidated through a combination of experimental efforts and high-level quantum mechanical calculations [dispersion-corrected (U)DFT, DLPNO-CCSD(T), and TD-DFT]. This comprehensive study highlights the necessity for EDA complexation for efficient alkyl radical generation. Computation of subsequent ground state pathways reveals that SH2 addition of the alkyl radical to the intermediate radical EDA complex is extremely exergonic and results in a charge transfer event from the dihydropyridine donor to the N-(trifluoromethylthio)phthalimide acceptor of the EDA complex. Experimental and computational results further suggest that product formation also occurs via SH2 reaction of alkyl radicals with 1,2-bis(trifluoromethyl)disulfane, generated in-situ through combination of thiyl radicals. (Figure presented.).
- Lipp, Alexander,Badir, Shorouk O.,Dykstra, Ryan,Gutierrez, Osvaldo,Molander, Gary A.
-
supporting information
p. 3507 - 3520
(2021/06/11)
-
- Nature of the Nucleophilic Oxygenation Reagent Is Key to Acid-Free Gold-Catalyzed Conversion of Terminal and Internal Alkynes to 1,2-Dicarbonyls
-
2,3-Dichloropyridine N-oxide, a novel oxygen transfer reagent, allows the conductance of the gold(I)-catalyzed oxidation of alkynes to 1,2-dicarbonyls in the absence of any acid additives and under mild conditions to furnish the target species, including those derivatized by highly acid-sensitive groups. The developed strategy is effective for a wide range of alkyne substrates such as terminal- and internal alkynes, ynamides, alkynyl ethers/thioethers, and even unsubstituted acetylene (40 examples; yields up to 99%). The oxidation was successfully integrated into the trapping of reactive dicarbonyls by one-pot heterocyclization and into the synthesis of six-membered azaheterocycles. This synthetic acid-free route was also successfully applied for the total synthesis of a natural 1,2-diketone.
- Dubovtsev, Alexey Yu.,Shcherbakov, Nikolay V.,Dar'in, Dmitry V.,Kukushkin, Vadim Yu.
-
p. 745 - 757
(2020/02/04)
-
- Oxidative C-C Bond Cleavage for the Synthesis of Aryl Carboxylic Acids from Aryl Alkyl Ketones
-
A metal-free and one-pot two-step synthesis of aryl carboxylic acids from aryl alkyl ketones has been achieved. The reactions were performed with iodine as the catalyst, DMSO and TBHP as the oxidants. Under the optimal reaction conditions, a number of aryl alkyl ketones could be converted into their corresponding aryl carboxylic acids in good to excellent yields (up to 94%).
- Xu, Liang,Wang, Shengpeng,Chen, Bajin,Li, Meichao,Hu, Xinquan,Hu, Baoxiang,Jin, Liqun,Sun, Nan,Shen, Zhenlu
-
supporting information
p. 1505 - 1509
(2018/05/25)
-
- Iridium-Catalyzed Asymmetric Hydrogenation of Unsaturated Piperazin-2-ones
-
Two different iridium catalyst systems, generated from the ruthenocene-based phosphine-oxazoline ligand tBu-mono-RuPHOX or the diphosphine ligand BINAP, were developed for the asymmetric hydrogenation of 5,6-dihydropyrazin-2(1H)-ones, affording chiral piperazin-2-ones in good yields and with moderate to good ees. Different catalytic behaviors for the hydrogenation of these types of substrate were observed with these two catalyst systems. Our tBu-mono-RuPHOX ligand, which bears a ruthenocene scaffold with planar chirality, was found to be the best ligand for the [Ir(L)(COD)]BArF catalyst system, affording the desired products with up to 94% ee. (Figure presented.).
- Wang, Yanzhao,Liu, Yuanyuan,Li, Kun,Yang, Guoqiang,Zhang, Wanbin
-
supporting information
p. 1933 - 1941
(2017/06/09)
-
- Experimental and Theoretical Studies on Iron-Promoted Oxidative Annulation of Arylglyoxal with Alkyne: Unusual Addition and Migration on the Aryl Ring
-
An Fe(III)-promoted oxidative annulation reaction was developed for the synthesis of 1,2-naphthoquinones. A variety of substituted arylglyoxals and internal alkynes undergo the transformation in the presence of FeCl3 at room temperature to afford the 1,2-naphthoquinone products in good yields in a short reaction time. Interestingly, the products show unusual pseudomigration of the substituent on the arene ring of arylglyoxals. A possible mechanism involving Fe(III)-promoted formation of a vinyl cation from arylglyoxal and alkyne, electrophilic addition of the vinyl cation to the ipso carbon of the aryl group to give a spiral intermediate, and then migration of the keto carbon to the ortho carbon was proposed as key steps and verified using quantum mechanics.
- Hung, Chen-Hsun,Gandeepan, Parthasarathy,Cheng, Lin-Chieh,Chen, Liang-Yu,Cheng, Mu-Jeng,Cheng, Chien-Hong
-
supporting information
p. 17015 - 17021
(2017/12/06)
-
- One-pot three-component reactions of methyl ketones, phenols and a nucleophile: An expedient way to synthesize densely substituted benzofurans
-
Three-component reactions of phenylglyoxal monohydrate, phenols, and indoles were developed with the aid of acid-catalyst, which produced various densely substituted benzofurans with good to excellent yields. On the basis of this observation, a one-pot, step-wise reaction was developed by using methyl ketones instead of using phenylglyoxal component in I2/DMSO system. At last, three-component reaction offered a useful way to synthesize densely substituted benzofurans starting from simple and easily available substrates. The indole component can be replaced by some other nucleophiles, such as 1,2,4-trimethoxybenzene and thiophenol.
- Cheng, Cheng,Liu, Changhui,Gu, Yanlong
-
p. 8009 - 8017
(2015/12/31)
-
- Iodine-mediated oxidative annulation for one-pot synthesis of pyrazines and quinoxalines using a multipathway coupled domino strategy
-
An efficient iodine-mediated oxidative annulation of aryl acetylenes-arylethenes-aromatic ketones with 1,2-diamines for the synthesis of pyrazines and regioselective synthesis of quinoxalines is presented. A multipathway coupled domino approach has been developed for the one-pot synthesis of 1,4-diazines with high functional group compatibility.
- Viswanadham, K. K. Durga Rao,Prathap Reddy, Muktapuram,Sathyanarayana, Pochampalli,Ravi, Owk,Kant, Ruchir,Bathula, Surendar Reddy
-
supporting information
p. 13517 - 13520
(2015/01/09)
-
- BENZOQUINAZOLINE DERIVATIVES AND THEIR USE IN TREATING BONE DISORDERS
-
A compound of formula (I) or a pharmaceutically acceptable salt or prodrug ester thereof, wherein the groups R2, R3, R4, Q, X and Y are as defined in the specification, is useful in the treatment of bone conditions related to increased calcium depletion or resorption.
- -
-
Page/Page column 25-26
(2008/06/13)
-
- 3-ALKYLIDENEHYDRAZINO SUBSTITUTED HETEROARYL COMPOUNDS AS THROMBOPOIETIN RECEPTOR ACTIVATORS
-
A compound represented by the formula (1): wherein A is a nitrogen atom or CR4, B is an oxygen atom, a sulfur atom or NR9 (provided that when A is a nitrogen atom, B is not NH), R1 is a C2-14; aryl group, L1 is a bond, CR10R11, an oxygen atom, a sulfur atom or NR12, X is OR13, SR13 or NR14NR15, R2 is a hydrogen atom, a formyl group, a C1-10; alkyl group or the like, L2 is a bond or the like, L3 is a bond, CR17R18, an oxygen atom, a sulfur atom or NR19, L4 is a bond, CR20R21, an oxygen atom, a sulfur atom or NR22, Y is an oxygen atom, a sulfur atom or NR23, and R3 is a C2-14; aryl group, a tautomer, prodrug or pharmaceutically acceptable salt of the compound or a solvate thereof.
- -
-
Page 532-533
(2008/06/13)
-