665033-51-2Relevant academic research and scientific papers
Fates of imine intermediates in radical cyclizations of N-sulfonylindoles and ene-sulfonamides
Zhang, Hanmo,Hay, E. Ben,Geib, Stephen J.,Curran, Dennis P.
, p. 1649 - 1655 (2015)
Two new fates of imine intermediates formed on radical cyclizations of ene-sulfonamides have been identified, reduction and hydration/fragmentation. Tin hydride-mediated cyclizations of 2-halo-N-(3-methyl-N-sulfonylindole)anilines provide spiro[indo-line-
Cycloisomerization of Carbamoyl Chlorides in Hexafluoroisopropanol: Stereoselective Synthesis of Chlorinated Methylene Oxindoles and Quinolinones
Bajohr, Jonathan,Lautens, Mark,Mirabi, Bijan,Rodríguez, José F.,Whyte, Andrew,Zhang, Anji
supporting information, p. 18478 - 18483 (2021/07/19)
Hexafluoroisopropanol (HFIP) was employed as an additive for the generation of 3-(chloromethylene)oxindoles via the chloroacylation of alkyne-tethered carbamoyl chlorides. This reaction avoids the use of a metal catalyst and accesses products in high yields and stereoselectivities. Additionally, this reaction is scalable and proved amenable to a series of product derivatizations, including the synthesis of nintedanib. The reactivity of alkene-tethered carbamoyl chlorides with hexafluoroisopropanol (HFIP) was harnessed towards the synthesis of 2-quinolinones.
Site-Selective Double and Tetracyclization Routes to Fused Polyheterocyclic Structures by Pd-Catalyzed Carbonylation Reactions
Bacchi, Alessia,Carfagna, Carla,Costa, Mirco,Della Ca', Nicola,Gabriele, Bartolo,Mancuso, Raffaella,Mazzeo, Paolo P.,Pancrazzi, Francesco,Sarti, Nicolò,Stirling, András
supporting information, p. 1569 - 1574 (2020/03/13)
In this contribution, we report novel palladium-catalyzed carbonylative cascade approaches to highly functionalized polyheterocyclic structures. The Pd-catalyzed carbonylative process involves the regioselective insertion of one to three CO molecules and the sequential ordered formation of up to eight new bonds (one C-O, two C-C, five C-N). The exclusive formation of six-membered heterocycles is elucidated by detailed modeling studies.
A carboxylate-assisted amination/unactivated C(sp2)-H arylation reactionviaa palladium/norbornene cooperative catalysis
An, Yang,Zhang, Bo-Sheng,Zhang, Zhe,Liu, Ce,Gou, Xue-Ya,Ding, Ya-Nan,Liang, Yong-Min
supporting information, p. 5933 - 5936 (2020/06/04)
This report describes a carboxylate-assisted palladium-catalysed Catellani reaction, which is compatible withortho-amination and unactivated C(sp2)-H arylation. This method was used to synthesize a series of 1-amino substituted dihydrophenanthridines, phenanthridines and 6H-benzo[c]chromenes. Based on kinetic isotope experiments, the kinetic curve proves that pivalic acid accelerates the reaction rate of unactivated C(sp2)-H activation, and thus this rate can keep up with the five membered aryl-norbornene-palladacycle (ANP) intermediate.
Synthesis of Aminated Phenanthridinones via Palladium/Norbornene Catalysis
Abel-Snape, Xavier,Whyte, Andrew,Lautens, Mark
supporting information, p. 7920 - 7925 (2020/11/02)
An ortho-amination, ipso-C-H arylation mediated by palladium/norbornene cooperative catalysis is reported. This reaction proceeds through a sequential intermolecular C-N bond formation process followed by intramolecular C-H activation of a tethered arene. The products, aminated phenanthridinones, were generated in moderate to good yields. This method is also applicable to the formation of dibenzazepinones.
Enantioselective Synthesis of 2-Oxindole Spirofused Lactones and Lactams by Heck/Carbonylative Cylization Sequences: Method Development and Applications
Hu, Huaanzi,Teng, Fan,Liu, Jian,Hu, Weiming,Luo, Shuang,Zhu, Qiang
supporting information, p. 9225 - 9229 (2019/07/16)
An efficient one-pot assembly of all-carbon spiro-oxindole compounds from non-oxindole-based materials has been developed through a palladium-catalyzed asymmetric Heck/carbonylative lactonization and lactamization sequence. Diversified spirooxindole γ-and
A catalyst-free and additive-free method for the synthesis of benzothiazolethiones from: O -iodoanilines, DMSO and potassium sulfide
Zhu, Xiaoming,Li, Wenguang,Luo, Xiai,Deng, Guobo,Liang, Yun,Liu, Jianbing
supporting information, p. 1970 - 1974 (2018/05/23)
Under catalyst-free and additive-free conditions, a novel, convenient, eco-friendly method for the synthesis of benzothiazolethiones has been developed. The three-component reaction of o-iodoanilines and K2S with DMSO proceeded smoothly and the corresponding benzothiazolethiones were obtained with good isolated yields. Meanwhile, this method could be used for the synthesis of thioureas from primary diamines. Furthermore, mechanism research showed that DMSO not only functioned as a carbon source, but also as a mild oxidant in this reaction.
Bis(dibenzylideneacetone)palladium(0)/tert-Butyl Nitrite- Catalyzed Cyclization of o-Alkynylanilines with tert-Butyl Nitrite: Synthesis and Applications of Indazole 2-Oxides
Senadi, Gopal Chandru,Wang, Ji-Qi,Gore, Babasaheb Sopan,Wang, Jeh-Jeng
, p. 2747 - 2753 (2017/08/23)
An efficient method for the synthesis of 1-benzyl/arylindazole 2-oxides via a bis(dibenzylideneacetone)palladium(0) [Pd(dba)2]/tert-butyl nitrite (TBN)-catalyzed reaction of o-alkynylaniline derivatives with TBN is reported. The overall transfo
Synthesis of benzannelated sultams by intramolecular Pd-catalyzed arylation of tertiary sulfonamides
Rassadin, Valentin A.,Scholz, Mirko,Klochkova, Anastasiia A.,De Meijere, Armin,Sokolov, Victor V.
supporting information, p. 1932 - 1939 (2017/09/27)
A new and efficient approach to five- and six-membered benzannelated sultams by intramolecular C-arylation of tertiary 1-(methoxycarbonyl)methanesulfonamides under palladium catalysis is described. In case of the α-toluenesulfonamide derivative, an unexpected formation of a 2,3-diarylindole was observed under the same conditions.
A new synthesis of indoles via intramolecular cyclization of ?-alkynyl N,N-dialkylanilines promoted by KOt-Bu/DMSO
Chen, Yan-Yan,Chen, Jia-Hua,Zhang, Niu-Niu,Ye, Lin-Miao,Zhang, Xue-Jing,Yan, Ming
, p. 478 - 481 (2015/03/05)
2-Aryl indoles could be prepared in excellent yields via the intramolecular cyclization of ?-alkynyl N,N-dialkylanilines. The reaction is efficiently promoted by the catalytic amount of KOt-Bu in DMSO at room temperature. A reaction mechanism involving α-
