73776-46-2Relevant academic research and scientific papers
Kinetically Controllable Pd-Catalyzed Decarboxylation Enabled [5 + 2] and [3 + 2] Cycloaddition toward Carbocycles Featuring Quaternary Carbons
Yan, Biwei,Zuo, Linhong,Chang, Xiaowei,Liu, Teng,Cui, Manying,Liu, Yang,Sun, Haiyu,Chen, Weipeng,Guo, Wusheng
supporting information, p. 351 - 357 (2021/01/26)
A decarboxylative protocol has been developed toward a range of carbocycles. The key success is based on the use of a batch of newly designed cyclic carbonates as substrates that can provide carbon-carbon zwitterion intermediate under palladium catalysis.
6s-3d {Ba3Zn4}-Organic Framework as an Effective Heterogeneous Catalyst for Chemical Fixation of CO2and Knoevenagel Condensation Reaction
Chen, Hongtai,Fan, Liming,Hu, Tuoping,Zhang, Xiutang
, p. 3384 - 3392 (2021/03/08)
The exquisite combination of Ba2+ and Zn2+ with the aid of 2,4,6-tri(2,4-dicarboxyphenyl)pyridine (H6TDP) under the condition of solvothermal self-assembly generates one highly robust [Ba3Zn4(CO2)12(HCO2)2(OH2)2]-organic framework of {[Ba3Zn4(TDP)2(HCO2)2(OH2)2]·7DMF·4H2O}n (NUC-27), in which adjacent 2D layers are interlaced via hydrogen-bonding interactions to form a 3D skeleton with peapod-like channels and nano-caged voids. It is worth emphasizing that both Ba2+ and Zn2+ ions in NUC-27 display the extremely low coordination modes: hexa-coordinated [Ba(1)] and tetra-coordinated [Ba(2), Zn(1), and Zn(2)]. Furthermore, to the best our knowledge, NUC-27 is one scarcely reported 2D-based nanomaterial with an unprecedented Z-shaped hepta-nuclear heterometallic cluster of [Ba3Zn4(CO2)12(HCO2)2(OH2)2] as SBUs, which not only has plentiful low-coordinated open metal sites but also has the excellent physicochemical properties including omni-directional opening pores, ultrahigh porosity, larger specific surface area, and the coexistence of Lewis acid-base sites. Just as expected, thanks to its rich active metal sites and pyridine groups as strong Lewis acid-base roles, completely activated NUC-27 displays high catalytic efficiency on the chemical transformation of epoxides with CO2 into cyclic carbonates under mild conditions and effectively accelerates the reaction process of Knoevenagel condensation.
Nickel?alkyne?functionalized metal?organic frameworks: An efficient and reusable catalyst
Chen, Huixin,Cheng, Hua,Li, Jilin,Li, Wei,Liao, Shengyun,Liu, Xin,Ning, Liangmin,Shao, Liming,Tang, Siyuan
, (2021/06/15)
Electron-donating groups in the robust MOF motif are able to provide an excellent catalytic platform, therefore obtaining site-isolated metal sites. In this study, the terminal alkyne is firstly introduced into UiO-66-type metal-organic frameworks (UiO-66-alkyne). Herein, to further study the application potential of this material, a covalently bonded nickel catalyst based on the alkynyl-tagged UiO-66-alkyne has been prepared and afforded us unprecedented highly dispersed and highly efficient catalytic active species. Meanwhile, this nickel-contained catalyst method for joining metals provided an alternative pathway regarding catalyst designing. With UiO-66-alkyne-Ni, the heterogeneous transformation of homogeneous catalysts is realized. Using benzaldehyde and malononitrile as starting materials, we were able to catalyze the Knoevenagel condensation within 45 min under room temperature with yield (> 99 %). Moreover, the recovery rate of the UiO-66-alkyne-Ni also outperformed previous MOFs in both small-scale and gram-level reactions, which shows UiO-66-alkyne-Ni is a potential contributor to the subsequent industrialization.
Phosphine-Catalyzed (4 + 2) Annulation of δ-Sulfonamido-Substituted Enones with 1,1-Dicyanoalkenes: Synthesis of Piperidine Derivatives
Liu, Min,Zhou, Leijie,Shi, Wangyu,Hu, Yimin,Liao, Jianning,Duan, Zeqing,Wang, Wei,Wu, Yongjun,Zheng, Bing,Guo, Hongchao
supporting information, p. 7703 - 7707 (2021/10/20)
The δ-sulfonamido-substituted enones were employed as phosphine acceptor in phosphine-catalyzed (4 + 2) annulation of 1,1-dicyanoalkenes. They served as a four-membered synthon to react with 1,1-dicyanoalkenes under mild reaction conditions, producing pip
Hydroquinone and benzoquinone-catalyzed aqueous Knoevenagel condensation
Koyama, Kaho,Kuwata, Marina,Sajiki, Hironao,Sawama, Yoshinari,Takakura, Ryoya,Yamada, Tsuyoshi
supporting information, p. 6594 - 6597 (2020/09/21)
A Knoevenagel condensation of various aldehydes with malononitrile effectively proceeded in the presence of hydroquinone/benzoquinone mixed catalysts at room temperature in H2O. Furthermore, γ-deuterium-labeled α,β-unsaturated nitrile derivatives were als
Photoredox-Catalyzed Addition of Carbamoyl Radicals to Olefins: A 1,4-Dihydropyridine Approach
Cardinale, Luana,Konev, Mikhail O.,Jacobi von Wangelin, Axel
supporting information, p. 8239 - 8243 (2020/06/20)
Functionalization with C1-building blocks are key synthetic methods in organic synthesis. The low reactivity of the most abundant C1-molecule, carbon dioxide, makes alternative carboxylation reactions with CO2-surrogates especially important. We report a photoredox-catalyzed protocol for alkene carbamoylations. Readily accessible 4-carboxamido-Hantzsch esters serve as convenient starting materials that generate carbamoyl radicals upon visible light-mediated single-electron transfer. Addition to various alkenes proceeded with high levels of regio- and chemoselectivity.
Controllable one-pot synthesis for scaffold diversity: Via visible-light photoredox-catalyzed Giese reaction and further transformation
Nam, Su Been,Khatun, Nilufa,Kang, Young Woo,Park, Boyoung Y.,Woo, Sang Kook
supporting information, p. 2873 - 2876 (2020/03/19)
This study presents a controllable one-pot synthesis for constructing valuable scaffolds (alcohols, 2,3-dihydrofurans, α-cyano-γ-butyrolactones, and γ-butyrolactones) via a visible-light photoredox-catalyzed Giese reaction and further transformation. This
Visible-Light Photoredox-Catalyzed α-Regioselective Conjugate Addition of Allyl Groups to Activated Alkenes
Gontala, Arjun,Woo, Sang Kook
supporting information, p. 3223 - 3228 (2020/07/06)
The α-regioselective conjugate addition of allyl groups to activated alkenes is a poorly explored area of research. Herein, we report an α-adduct and (E)-isomer selective conjugate addition of allylsilanes to activated alkenes by visible-light photoredox catalysis. The reaction involves allylic radicals that can be generated from allylsilanes through a photoinduced single-electron transfer mechanism. (Figure presented.).
Preparation of O-Protected Cyanohydrins by Aerobic Oxidation of α-Substituted Malononitriles in the Presence of Diarylphosphine Oxides
Zhang, Dapeng,Lian, Mingming,Liu, Jia,Tang, Shukun,Liu, Guangzhi,Ma, Cunfei,Meng, Qingwei,Peng, Haisheng,Zhu, Daling
supporting information, p. 2597 - 2601 (2019/04/17)
A mild, reagent-cyanide-free, and efficient synthesis of O-phosphinoyl-protected cyanohydrins from readily available α-substituted malononitriles was realized using diarylphosphine oxides in the presence of O2. Mechanistic studies indicated that in addition to the initial aerobic oxidation of the malononitrile derivative notable features of this process include the formation of a tetrahedral intermediate and a subsequent intramolecular rearrangement. The phosphinoyl-protecting group can be removed by alcoholysis or by reduction with DIBAL-H.
