19947-80-9Relevant academic research and scientific papers
Electrochemically enabled rhodium-catalyzed [4 + 2] annulations of arenes with alkynes
Chen, Jia-Yi,Li, Ming,Li, Rui-Tao,Ma, Qiang,Ni, Shao-Fei,Wang, Zi-Chen,Wen, Li-Rong,Zhang, Lin-Bao
supporting information, p. 9515 - 9522 (2021/12/09)
Herein, electrochemically driven, Rh(iii)-catalyzed regioselective annulations of arenes with alkynes have been established. The strategy, combining the use of a rhodium catalyst with electricity, not only avoids the need for using a stoichiometric amount of external oxidant, but also ensures that the transformations proceed under mild and green conditions, which enable broad functional group compatibility with a variety of substrates, including drugs and pharmaceutical motifs. Moreover, the electrolysis reaction was made operationally simple by employing an undivided cell, and proceeds efficiently in aqueous solution in air. This journal is
Water-Tolerant ortho-Acylation of Phenols
Tian, Jie-Sheng,He, Yu,Gao, Zhi-Yuan,Liu, Xu,Dong, Shuang-Feng,Wu, Peng,Loh, Teck-Peng
supporting information, p. 6594 - 6598 (2021/09/02)
A metal-free, water-tolerant, and one-pot process for ortho-acylation of phenols promoted by the iodine source/hydrogen peroxide system has been developed. This transformation undergoes ether formation, iodocyclization, C-C bond cleavage, and oxidative hydrolysis in a one-step manner, which is supported by control experiments.
Synthesis of pterocarpans through palladium-catalyzed oxyarylation of alkoxy-2H-chromenes with o-iodophenols
Gaspar, Francisco V.,Barcellos, Julio C.F.,Cívicos, José F.,Merino, Pedro,Nájera, Carmen,Costa, Paulo R.R.
, (2020/10/22)
The oxyarylation of alkoxy-2H-chromenes (1a-e) with o-iodophenols substituted by electron-withdrawing (CHO) and electron-donating (OMe) groups is studied under two experimental conditions: a) Pd(OAc)2, Ag2CO3 in PEG-400 at 140 °C, 10 min and b) oxime-based palladacycle, DIPEA, in PEG-400 at 150 °C, 3–4 h. Pterocarpans are obtained in moderate to good chemical yields.
Kojic acid–natural product conjugates as mushroom tyrosinase inhibitors
Ashooriha, Morteza,Emami, Saeed,Kardan, Mostafa,Khoshneviszadeh, Mahsima,Khoshneviszadeh, Mehdi,Rafiei, Alireza,Yazdian-Robati, Rezvan
, (2020/07/10)
As part of our effort to develop potential tyrosinase inhibitors, we have conjugated the well-known tyrosinase inhibitor kojic acid (KA) with several phenolic natural products such as umbelliferone, sesamol, thymol, carvacrol, eugenol, isoeugenol, vanilli
Copper-Catalyzed Ring Opening of [1.1.1]Propellane with Alkynes: Synthesis of Exocyclic Allenic Cyclobutanes
Lasányi, Dániel,Tolnai, Gergely L.
supporting information, p. 10057 - 10062 (2019/12/24)
Despite the long history and interesting properties of propellanes, these compounds still have tremendous potential to be exploited in synthetic organic chemistry. Herein we disclose an experimentally simple procedure to achieve cyclobutane-containing allenes and alkynes through a copper-catalyzed ring opening of [1.1.1]propellane and subsequent reaction with ethynes.
Thermally Induced Denitrogenative Annulation for the Synthesis of Dihydroquinolinimines and Chroman-4-imines
Chou, Chih-Hung,Chen, Ying-Yu,Rajagopal, Basker,Tu, Hsiu-Chung,Chen, Kuan-Lin,Wang, Sheng-Fu,Liang, Chien-Fu,Tyan, Yu-Chang,Lin, Po-Chiao
supporting information, p. 757 - 765 (2016/03/09)
A rapid growth in synthetic methods for the preparation of diverse organic molecules using N-sulfonyl-1,2,3-triazoles is of great interest in organic synthesis. Transition metals are generally used to activate the α-imino diazo intermediates. Metal-free methods have not been studied in detail, but can be a good complement to transition metal catalysis in the mild reaction conditions. We herein report a novel method for the preparation of 2,3-dihydroquinolin-4-imine and chroman-4-imine analogs from their corresponding N-sulfonyl-1,2,3-triazoles in the absence of metal catalysts. To achieve intramolecular annulation, the introduction of an electron-donating group is required at the meta position of N-sulfonyl-1,2,3-triazole methyl anilines. The inclusion of tailored substituents on the aniline moieties and nitrogen atoms enhances the nucleophilicity of the phenyl π-electrons, thus allowing them to undergo a Friedel-Crafts-type reaction with the highly electrophilic ketenimines. This metal-free method was carefully optimized to generate a variety of dihydroquinolin-4-imines and chroman-4-imines in moderate-to-good yields.
Synthesis of substituted 3-methylene-2,3-dihydrobenzofurans and 3-methylbenzofurans by rhodium (II)-catalyzed annulation
Chen, Ying-Yu,Chen, Kuan-Lin,Tyan, Yu-Chang,Liang, Chien-Fu,Lin, Po-Chiao
, p. 6210 - 6218 (2015/08/03)
Abstract The selective synthesis of substituted 3-methylene-2,3-dihydrobenzofurans and 3-methylbenzofurans has developed through Rh(II)-catalyzed denitrogenative annulation of N-sulfonyl-1,2,3-triazole at ambient to mild heating condition, respectively. F
Semi-synthesis and biological evaluation of 1,2,3-triazole-based podophyllotoxin congeners as potent antitumor agents inducing apoptosis in HepG2 cells
Chen, Jinying,Ma, Liang,Zhang, Ronghong,Tang, Jie,Lai, Huijun,Wang, Jun,Wang, Guangcheng,Xu, Qinyuan,Chen, Tao,Peng, Fei,Qiu, Jingxiang,Liang, Xiaolin,Cao, Dong,Ran, Yan,Peng, Aihua,Wei, Yuquan,Chen, Lijuan
, p. 945 - 956 (2013/02/22)
A series of 4β-[(4-substituted)-1,2,3-triazol-1-yl]podophyllotoxin congeners were synthesized by employing click chemistry and further evaluated for their antitumor activity by MTT assay. Among them, six congeners (10, 11, 12, 13, 22, and 24) exhibited ap
SUBSTITUTED ALKYNYL PHENOXY COMPOUNDS AS NEW SYNERGISTS IN PESTICIDAL COMPOSITIONS
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Page/Page column 19, (2011/04/13)
A composition comprising an alkynyl phenoxy compound of Formula (I) as a synergist and a pesticidal active ingredient is described, wherein R1 and R2, similar or different, are (C1-C4)alkyl or R1O- an
Substituted alkynyl phenoxy compounds and their uses
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Page/Page column 10, (2011/04/14)
An alkynyl phenoxy compound of Formula (I) is described, wherein R1 and R2, similar or different, are (C1-C4)alkyl or R1O- and R2O- together represent a group -O-CH2-O-, -O-CH(CH
