26409-32-5Relevant articles and documents
Base-promoted one-pot synthesis of pyridine derivatives via aromatic alkyne annulation using benzamides as nitrogen source
Ashiq, Muhammad Naeem,Hua, Ruimao,Iqbal, Muhammad Asif,Mehmood, Hina
supporting information, (2021/11/08)
In the presence of Cs2CO3, the first simple, efficient, and one-pot procedure for the synthesis of 3,5-diaryl pyridines via a variety of aromatic terminal alkynes with benzamides as the nitrogen source in sulfolane is described. The formation of pyridine derivatives accompanies the outcome of 1,3-diaryl propenes, which are also useful intermediates in organic synthesis. Thus, pyridine ring results from a formal [2+2+1+1] cyclocondensation of three alkynes with benzamides, and one of the alkynes provides one carbon, whilst benzamides provide a nitrogen source only. A new transformation of alkynes as well as new utility of benzamide are found in this work.
Method for constructing 3,5-disubstituted pyridine by utilizing mixed styrene derivative and N,N-dimethylformamide
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Paragraph 0101-0107, (2020/08/27)
The invention discloses a method for constructing 3,5-disubstituted pyridine by utilizing mixed styrene derivative and N,N-dimethylformamide. The method comprises the following step: subjecting the mixed styrene derivative, N,N-dimethylformamide and peroxydisulfate to a cyclization reaction under the catalytic action of iodized salt so as to obtain symmetrical and asymmetrical mixed 3,5-disubstituted pyridine products at the same time. According to the method, 3,5-disubstituted pyridine is synthesized from the mixed styrene derivative and DMF through one-step oxidative cyclization under the catalysis of iodate; and the method has the advantages of low raw material and catalyst cost, mild reaction conditions, capability of realizing high-yield preparation of the symmetrical and asymmetrical3,5-disubstituted pyridine products at the same time and the like.
Insight into Copper Catalysis: In Situ Formed Nano Cu2O in Suzuki-Miyaura Cross-Coupling of Aryl/Indolyl Boronates
Ranjani, Ganapathy,Nagarajan, Rajagopal
, p. 3974 - 3977 (2017/08/14)
A ligand-free copper catalyzed Suzuki-Miyaura coupling of 3,5-diiodopyridine with aryl and indole boronates has been explored in good to excellent yields. In situ generation of nano-Cu2O from CuCl2 under the reaction conditions has been discovered for the first time. The generality of the reaction was further demonstrated by the arylation of 5-iodopyrimidine, iodopyridines, iodobenzenes, and diiodobenzenes and resulted in good to moderate yields. Moreover, bisindole alkaloid Scalaridine A has been successfully synthesized in 60% overall yield.