摘要 已经开发了通过碱基促进方案与1,2,4-噻二氮杂骨架融合的杜鹃花的合成方法。1 H -Azole-2-羧酸盐和N-(氯甲基)-N-甲基甲磺酰胺被用作一锅法和两步反应序列中的歧义结构单元。研究了所获得的杜鹃花与胺,肼,DMFDMA和NaBH 4的反应的化学行为。在合成新的吡唑和嘧啶杂环中,利用了来自氮杂苏丹草的烯胺基酮。
摘要 已经开发了通过碱基促进方案与1,2,4-噻二氮杂骨架融合的杜鹃花的合成方法。1 H -Azole-2-羧酸盐和N-(氯甲基)-N-甲基甲磺酰胺被用作一锅法和两步反应序列中的歧义结构单元。研究了所获得的杜鹃花与胺,肼,DMFDMA和NaBH 4的反应的化学行为。在合成新的吡唑和嘧啶杂环中,利用了来自氮杂苏丹草的烯胺基酮。
Solid‐State Radical C−H Trifluoromethylation Reactions Using Ball Milling and Piezoelectric Materials
作者:Yadong Pang、Joo Won Lee、Koji Kubota、Hajime Ito
DOI:10.1002/anie.202009844
日期:2020.12.7
The application of piezoelectricity for the generation of trifluoromethyl (CF3) radicals is reported together with the development of a method for the mechanochemical C−H trifluoromethylation of aromatic compounds. As compared to conventional solution‐based approaches, this mechanoredox C−H trifluoromethylation enables cleaner and more sustainable access to a wide range of trifluoromethylated N‐heterocycles
trifluoromethylation of various aromatic compounds with Umemoto reagent II (2,8-difluoro-5-(trifluoromethyl)-5H-dibenzo[b,d]thiophen-5-ium triflate) proceeded in moderate to good yields under simple photo-irradiation conditions without any catalyst, additive, or activator. UV-Vis and NMR spectral analyses indicated that pre-formation of an electron donor-acceptor complex between the trifluoromethylating
Exploring the Structure and Performance of Cd–Chalcogenide Photocatalysts in Selective Trifluoromethylation
作者:Krishnamoorthy Muralirajan、Rajesh Kancherla、Jeremy A. Bau、Mayur Rahul Taksande、Muhammad Qureshi、Kazuhiro Takanabe、Magnus Rueping
DOI:10.1021/acscatal.1c04053
日期:2021.12.17
their increased photocatalytic activity toward trifluoromethylation with various substrates, such as (hetero)arenes and vinylic amides/acids, via addition, cyclization, and decarboxylation under visible light. The economic significance of this strategy is also highlighted through the scalable synthesis of biologically active molecules followed by catalyst reuse. Moreover, these catalysts are relatively
由于催化剂的经济性和可重复使用性,非均相光氧化还原催化领域已经大幅增长并影响了有机合成。该研究报告了用 Cd-硫族化物半导体进行自由基三氟甲基化。Cd 半导体,特别是 CdSe,是容易获得的、商业化的、可见光响应的、异质光催化剂。容易获得的 Cd 半导体,尤其是 CdSe 的潜力,通过在可见光下通过加成、环化和脱羧作用,提高了对各种底物(如(杂)芳烃和乙烯基酰胺/酸)三氟甲基化的光催化活性得到证实。通过生物活性分子的可扩展合成以及随后的催化剂再利用,也突出了该策略的经济意义。而且,
Continuous Flow Homolytic Aromatic Substitution with Electrophilic Radicals: A Fast and Scalable Protocol for Trifluoromethylation
作者:Júlia L. Monteiro、Paula F. Carneiro、Petteri Elsner、Dominique M. Roberge、Peter G. M. Wuts、Katherine C. Kurjan、Bernhard Gutmann、C. Oliver Kappe
DOI:10.1002/chem.201604579
日期:2017.1.1
continuous flow radical C−C bond formation under Minisci‐type reaction conditions. The transformations are performed at or below room temperature employing hydrogen peroxide (H2O2) and dimethylsulfoxide (DMSO) as reagents in the presence of an FeII catalyst. For electron‐rich aromatic and heteroaromatic substrates, C−C bond formation proceeds satisfactorily with electrophilicradicals including .CF3
我们报告了在Minisci型反应条件下操作简单,快速连续的流动自由基C-C键的形成。在Fe II催化剂的存在下,使用过氧化氢(H 2 O 2)和二甲基亚砜(DMSO)作为试剂,在室温或低于室温的条件下进行转化。对于富电子芳族和杂芳族底物,包括C在内的亲电子基团可以令人满意地进行C-C键的形成。CF 3,。Ç 4 ˚F 9,。CH 2 CN和。CH 2 CO 2等等 相反,电子贫乏的底物表现出最小的反应性。重要的是,使用CF 3 I和C 4 F 9 I作为试剂的三氟甲基化和九氟甲基丁基化反应在几秒钟的停留时间内就以极高的转化率快速进行了选定的底物。本方法的吸引人的特征是试剂的低成本和异常高的反应速率。将该方案直接应用到二氢麦角胺(一种复杂的麦角生物碱)中,在连续流动的微型反应器中,在0.6千克规模的反应器中,在12秒内产生了相应的三氟甲基麦角灵衍生物。二氢麦角胺的三氟甲基衍生物是用于治疗偏头痛的有前途的治疗剂。
Graphitic Carbon Nitride Polymer as a Recyclable Photoredox Catalyst for Fluoroalkylation of Arenes
作者:Moritz Baar、Siegfried Blechert
DOI:10.1002/chem.201405505
日期:2015.1.7
Heterogeneous catalysis for trifluoromethylations and perfluoroalkylations has been performed. Through the usage of cheap, metal‐free and recyclable mesoporous graphitic carbonnitride (mpg‐CN) it was possible to fluoroalkylate various arenes by the reductive activation of sulfonyl chlorides with visible light. Thus, we were able to demonstrate the robustness and versatility of mpg‐CN as a photoredox