1072123-53-5Relevant articles and documents
On water: iodine-mediated direct construction of 1,3-benzothiazines from ortho-alkynylanilines by regioselective 6-exo-dig cyclization
Saini, Kapil Mohan,Saunthwal, Rakesh K.,Kumar, Shiv,Verma, Akhilesh K.
, p. 2657 - 2662 (2019)
Herein, we report the 6-exo-dig ring closure of ortho-alkynylanilines with readily available aroyl isothiocyanate. An environmentally benign, metal- and base-free, iodine promoted cascade synthesis of highly functionalized (benzo[1,3]thiazin-2-yl)benzimid
Transition-Metal Controlled Diastereodivergent Radical Cyclization/Azidation Cascade of 1,7-Enynes
Zhao, Yingying,Hu, Yancheng,Wang, Haolong,Li, Xincheng,Wan, Boshun
, p. 4412 - 4420 (2016)
A strategy for achieving diastereodivergent azidations of enynes has been developed, employing azide transfer from the M-N3 complex to alkyl radicals. Following this concept, the diastereoselectivity has been switched by modulating the transition metals and the ligands. The Mn(III)-mediated radical cyclization/azidation cascade of 1,7-enynes afforded trans-fused pyrrolo[3,4-c]quinolinones, whereas the Cu(II)/bipyridine system gave cis-products.
Photocatalyzed Intramolecular [2+2] Cycloaddition of N-Alkyl-N-(2-(1-arylvinyl)aryl)cinnamamides
de Souza, Wanderson C.,Matsuo, Bianca T.,Matos, Priscilla M.,Correia, José Tiago M.,Santos, Marilia S.,K?nig, Burkhard,Paix?o, Marcio W.
supporting information, p. 3722 - 3728 (2021/02/03)
N-Alkyl-N-(2-(1-arylvinyl)aryl)cinnamamides are converted into natural product inspired scaffolds via iridium photocatalyzed intramolecular [2+2] photocycloaddition. The protocol has a broad substrate scope, whilst operating under mild reaction conditions. Tethering four components forming a trisubstituted cyclobutane core builds rapidly high molecular complexity. Our approach allows the design and synthesis of a variety of tetrahydrocyclobuta[c]quinolin-3(1H)-ones, in yields ranging between 20–99 %, and with excellent regio- and diastereoselectivity. Moreover, it was demonstrated that the intramolecular [2+2]-cycloaddition of 1,7-enynes—after fragmentation of the cyclobutane ring—leads to enyne-metathesis-like products.
Cascade Reactions Assisted by Microwave Irradiation: Ultrafast Construction of 2-Quinolinone-Fused γ-Lactones fromN-(o-Ethynylaryl)acrylamides and Formamide
Sacchelli, Bruce A. L.,Rocha, Bianca C.,Andrade, Leandro H.
supporting information, p. 5071 - 5075 (2021/07/20)
An ultrafast (10 s) methodology to construct novel highly functionalized 2-quinolinones fromN-(o-ethynylaryl)acrylamides (1,7-enynes) is described for the first time. Microwave irradiation enabled the ultrafast synthesis of 2-quinolinone-fused γ-lactones from Fenton’s reagents in formamide. After six key consecutive reactions, including a diastereoselective step, 2-quinolinone-fused γ-lactones were obtained in good overall yield (up to 46%; 10 s).
Gold-Catalyzed Cascade and Divergent Synthesis of Indolobenzazepines and Indoloquinolines from Nitrogen-Tethered 1,8-Diynes
Ito, Mamoru,Onoda, Hideaki,Shibata, Takanori,Takaki, Asahi
supporting information, (2022/01/22)
We describe the divergent construction of two nitrogen-containing polycyclic systems by gold-catalyzed cycloisomerizations. The gold-catalyzed cascade hydroamination and 7-endo-dig-selective cycloisomerization of nitrogen-tethered 1,8-diynes yielded indol
Regioselective Synthesis of Substituted Carbazoles, Bicarbazoles, and Clausine C
Points, Gary L.,Beaudry, Christopher M.
supporting information, p. 6882 - 6885 (2021/09/11)
Substituted carbazoles are efficiently constructed from 3-triflato-2-pyrones and alkynyl anilines. Multiple substituents are tolerated on the carbazole, and complete control of regiochemistry is observed. Complicated and sterically congested substitution patterns are produced. This strategy is also used to prepare substituted bicarbazoles and related biaryls. Finally, the method was showcased in a synthesis of the carbazole natural product clausine C.
Palladium-Catalyzed Oxidative [2 + 2 + 1] Annulation of 1,7-Diynes with H2O: Entry to Furo[3,4- c]quinolin-4(5 H)-ones
Ouyang, Xuan-Hui,Tan, Fang-Lin,Song, Ren-Jie,Deng, Wei,Li, Jin-Heng
supporting information, p. 6765 - 6768 (2018/10/24)
A novel cascade annulation of 1,7-diynes with water has been developed for the synthesis of furo[3,4-c]quinolin-4(5H)-one skeletons with high atom- and step-economy. The transformation was enabled by a palladium catalyst in the presence of copper salt as
Nickel Catalysis Enables Hetero [2+2+1] Cycloaddition between Yne-Isothiocyanates and Isonitriles with Low Catalyst Loading
Liu, Rui-Juan,Wang, Peng-Fei,Yuan, Wen-Kui,Wen, Li-Rong,Li, Ming
supporting information, p. 1373 - 1378 (2017/04/18)
Nickel(II) can be used to catalyze the hetero [2+2+1] cycloaddition of 2-alkynylaryl isothiocyanates and isonitriles in 2-methyltetrahydrofuran (2-MeTHF) to give a wide array of thieno[2,3-b]indoles in excellent yields. The reaction is featured by employi
Complex Annulations through Silver Carbenoid Intermediate: An Alternative Entry to Transformations of 1,2,3-Triazoles
Yang, Yuan,Yu, Jiang-Xi,Ouyang, Xuan-Hui,Li, Jin-Heng
supporting information, p. 3982 - 3985 (2017/08/14)
An alternative entry to transformations of N-sulfonyl-4-(2-(ethynyl)aryl)-1,2,3-triazoles with various generated in situ or external nucleophiles by means of silver catalysis for producing diverse functionalized isoquinolines is described. Mechanistically
P-TsOH Promoted Au(I)-Catalyzed Consecutive Endo Cyclization of Yne-Tethered Ynamide: Access to Benzofused Dihydroisoquinolones
Nayak, Sanatan,Ghosh, Nayan,Prabagar,Sahoo, Akhila K.
supporting information, p. 5662 - 5665 (2015/12/01)
A novel synthetic route to benzo[f]dihydroisoquinolone through a p-TsOH promoted cascade cyclization of easily accessible diyne-tethered ynamides in the presence of a Au(I)-catalyst is described. This reaction unveils a broad substrate scope, constructing a wide range of benzo[f]dihydroisoquinolones in good yields. The diyne-tethered ynamides are synthesized from inexpensive o-iodoaniline through Sonogashira couplings and the Cu-mediated C-N bond formation. The role of p-TsOH is examined, and the reaction pathway is also deduced. The benzo[f]isoquinoline scaffold is constructed from benzo[f]dihydroisoquinolones.