Substrate Promiscuity of <i>ortho</i>-Naphthoquinone Catalyst: Catalytic Aerobic Amine Oxidation Protocols to Deaminative Cross-Coupling and <i>N</i>-Nitrosation
作者:Tengda Si、Hun Young Kim、Kyungsoo Oh
DOI:10.1021/acscatal.9b03442
日期:2019.10.4
been identified as versatile aerobicoxidationcatalysts. Primary amines were readily cross-coupled with primary nitroalkanes via deaminative pathway to give nitroalkene derivatives in good to excellent yields. Secondary and tertiary amines were inert to ortho-naphthoquinone catalysts; however, secondary nitroalkanes were readily converted by ortho-naphthoquinone catalysts to the corresponding nitrite
Condensation of carbonyl derivatives 2 with active methylene compounds 1 is efficiently achieved, within 3 to 15 minutes under microwave irradiation by a solvent free reaction in the presence of carefully adjusted amounts of piperidine leading to Knoevenagel products 3 in good to excellent yields.
Nano CoFe<sub>2</sub>O<sub>4</sub> supported antimony(<scp>iii</scp>) as an efficient and recyclable catalyst for one-pot three-component synthesis of multisubstituted pyrroles
A novelmagnetic nano-CoFe2O4 supported Sb ([CoFe2O4@SiO2–DABCO–Sb]) was successfully constructed, which exhibited high catalytic activity for one-potthree-componentsynthesis of multisubstituted pyrroles in the reaction of amines, nitroolefin and 1,3-dicarbonyl compounds. The magneticheterogeneouscatalyst could be easily recovered using an external magnet and reused many times without significant
成功地构建了一种新型的磁性纳米CoFe 2 O 4负载的Sb([CoFe 2 O 4 @SiO 2 –DABCO-Sb]),该催化剂对多取代吡咯的一锅三组分合成具有很高的催化活性。胺,硝基烯烃和1,3-二羰基化合物。磁性非均相催化剂可以使用外部磁体容易地回收,并且可以多次重复使用而不会显着降低催化活性。
Synthesis of Benzo[4,5]imidazo[2,1-<i>b</i>
]thiazole by Copper(II)-Catalyzed Thioamination of Nitroalkene with 1<i>H</i>
-Benzo[<i>d</i>
]imidazole-2-thiol
作者:Sourav Jana、Amrita Chakraborty、Valerii Z. Shirinian、Alakananda Hajra
DOI:10.1002/adsc.201800393
日期:2018.6.15
A Copper(II)‐catalyzed thioamination of β‐nitroalkene with 1H‐benzo[d]imidazole‐2‐thiol has been developed for the synthesis of benzo[4,5]imidazo[2,1‐b]thiazole derivatives. A variety of N‐fused benzoimidazothiazole derivatives are obtained in high yields through successive C−N and C−S bond formations. This protocol is also applicable to β‐substituted β‐nitroalkenes to afford 2,3‐disubstituted benzoimidazothiazoles
已开发出一种铜(II)催化的β-硝基烯烃与1 H-苯并[ d ]咪唑-2-硫醇的硫胺化反应,用于合成苯并[4,5]咪唑并[2,1– b ]噻唑衍生物。通过连续的CN和CS键形成,可以高收率获得各种N稠合的苯并咪唑并噻唑衍生物。该方案也适用于β-取代的β-硝基烯烃,以提供2,3-二取代的苯并咪唑并噻唑。
Synthesis of Spiro[indole-3,5′-isoxazoles] with Anticancer Activity via a Formal [4 + 1]-Spirocyclization of Nitroalkenes to Indoles
作者:Alexander V. Aksenov、Dmitrii A. Aksenov、Nikolai A. Arutiunov、Nicolai A. Aksenov、Elena V. Aleksandrova、Zhenze Zhao、Liqin Du、Alexander Kornienko、Michael Rubin
DOI:10.1021/acs.joc.9b00808
日期:2019.6.7
An acid-assisted [4 + 1]-cycloaddition of indoles with nitrostyrenes affords 4′H-spiro[indole-3,5′-isoxazoles] in a diastereomerically pure form. Several of these spirocyclic molecules exhibit promising anticancer activity by reducing viability and inducingdifferentiation of neuroblastoma cells.