157017-41-9Relevant academic research and scientific papers
Synthesis of fluoren-9-ones by the palladium-catalyzed cyclocarbonylation of o-halobiaryls
Campo, Marino A.,Larock, Richard C.
, p. 5616 - 5620 (2002)
The synthesis of various substituted fluoren-9-ones has been accomplished by the palladium-catalyzed cyclocarbonylation of o-halobiaryls. The cyclocarbonylation of 4′-substituted 2-iodobiphenyls produces very high yields of 2-substituted fluoren-9-ones bearing either electron-donating or electron-withdrawing substituents. 3′-Substituted 2-iodobiphenyls afford 3-substituted fluoren-9-ones in excellent yields with good regioselectivity. This chemistry has been successfully extended to polycyclic fluorenones and fluorenones containing fused isoquinoline, indole, pyrrole, thiophene, benzothiophene, and benzofuran rings.
A solvent-free manganese(II) -catalyzed Clauson-Kaas protocol for the synthesis of N-aryl pyrroles under microwave irradiation
Rohit, Kizhakkekuttu Radhakrishnan,Meera, Gopinadh,Anilkumar, Gopinathan
supporting information, p. 194 - 200 (2021/10/12)
The first manganese-catalyzed modified Clauson-Kaas reaction for N-substituted pyrrole synthesis using 2,5-dimethoxytetrahydrofuran with variously substituted aromatic amines has been developed (up to 89% yield). This interesting neat strategy is free from additives including co-catalysts, ligands, and acids. Relatively low cost, environmentally benign, and handy Mn(NO3)2·4H2O is employed as the catalyst under microwave conditions with a very short reaction time (20?min). The above qualities attest to the green nature of this reaction.
Scalable electrochemical synthesis of diaryliodonium salts
Elsherbini, Mohamed,Moran, Wesley J.
supporting information, p. 4706 - 4711 (2021/06/11)
Cyclic and acyclic diaryliodonium are synthesised by anodic oxidation of iodobiaryls and iodoarene/arene mixtures, respectively, in a simple undivided electrolysis cell in MeCN-HFIP-TfOH without any added electrolyte salts. This atom efficient process does not require chemical oxidants and generates no chemical waste. More than 30 cyclic and acyclic diaryliodonium salts with different substitution patterns were prepared in very good to excellent yields. The reaction was scaled-up to 10 mmol scale giving more than four grams of dibenzo[b,d]iodol-5-ium trifluoromethanesulfonate (>95%) in less than three hours. The solvent mixture of the large-scale experiment was recovered (>97%) and recycled several times without significant reduction in yield.
MICROCAPSULES AND PROCESSES FOR THEIR PREPARATION
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Page/Page column 33; 41; 42, (2019/06/11)
The present invention provides microcapsules encapsulating hydrophilic or hydrophobic active agents in an inorganic shell, processes for their preparation and compositions comprising them.
Synthesis of indolizine derivatives containing eight-membered rings: Via a gold-catalyzed two-fold hydroarylation of diynes
Liu, Ruixing,Wang, Qiang,Wei, Yin,Shi, Min
supporting information, p. 1225 - 1228 (2018/02/09)
A gold-catalyzed method for the construction of indolizines with eight-membered rings has been developed. The reaction proceeded through a two-fold hydroarylation with indole or pyrrole derivatives containing a 1,6-diyne using a tri(1-adamantyl)phosphine
Synthesis of 1,3-Azaphospholes with Pyrrolo[1,2- a]quinoline Skeleton and Their Optical Applications
Wu, Di,Chen, Lingfeng,Ma, Shuangliang,Luo, Huiying,Cao, Jing,Chen, Runfeng,Duan, Zheng,Mathey, Francois
, p. 4103 - 4106 (2018/07/15)
A facile synthesis of 1,3-azaphospholes with a pyrrolo[1,2-a]quinoline skeleton has been described. These new annulated 1,3-azaphospholes exhibit good photoelectric performance and can be used as the emitting dopant in organic light-emitting diodes (OLEDs) and dye for bioimaging.
Palladium-Catalyzed Synthesis of Tetrasubstituted Olefins by Triple Domino Process
Naveen, Kanagaraj,Nikson, Savariyappan Albert,Perumal, Paramasivan Thirumalai
supporting information, p. 2407 - 2413 (2017/07/22)
An efficient, highly regio- and stereoselective protocol for the synthesis of tetrasubstituted olefins was developed to take place by a palladium(0)-catalyzed triple domino process. It involves the formation of three new C?C bonds through double carbopalladation and C?H activation across 2-bromoaryl alkynyl biaryls/heteroaryls with norbornene. This method is practically simple with broad substrate scope and tolerates a wide range of substituents. The products bearing 9H-pyrrolo[1,2-a]indole motifs reveal intriguing solid state fluorescence properties and thus form a new class of aggregation induced emission (AIE) fluorophores. (Figure presented.).
Construction of benzo-fused indolizines, pyrrolo[1,2-a]quinolines via alkyne-carbonyl metathesis
Nayak, Maloy,Kim, Ikyon
supporting information, p. 9697 - 9708 (2015/09/28)
The strategic use of a sequential Sonogashira coupling/intramolecular alkyne-carbonyl metathesis process for the synthesis of a pyridine ring from 1-(2-haloaryl)-1H-pyrrole-2-carbaldehydes allowed ready access to diverse novel benzo-fused indolizines, pyr
One-Pot Synthesis of Pyrrolo[1,2- a ]quinoxaline Derivatives via a Copper-Catalyzed Aerobic Oxidative Domino Reaction
Liu, Huanhuan,Duan, Tiantian,Zhang, Zeyuan,Xie, Caixia,Ma, Chen
supporting information, p. 2932 - 2935 (2015/06/30)
A copper-catalyzed process for the synthesis of pyrrolo[1,2-a]quinoxalines from readily available α-amino acids and 1-(2-halophenyl)-1H-pyrroles is described. Different functional groups were well tolerated to give the corresponding products.
Expeditious synthesis of tetrasubstituted helical alkenes by a cascade of palladium-catalyzed C-H activations
Liu, Hongqiang,El-Salfiti, Mohamed,Lautens, Mark
supporting information, p. 9846 - 9850 (2012/11/07)
Twisted molecules: A modular approach for the synthesis of tetrasubstituted helical alkenes by a palladium-catalyzed norbornene-mediated domino reaction is presented. This intermolecular domino process allows the formation of three C-C bonds in one operation through a C-H activation/carbopalladation/C-H activation sequence. Copyright
