Synthesis of Trisubstituted Pyridines<i>via</i>Chemoselective Suzuki-Miyaura Coupling of 3,5- and 4,6-Dibromo-2-tosyloxypyridines
作者:Cho-Hee Park、Yong-Ju Kwon、In-Young Oh、Won-Suk Kim
DOI:10.1002/adsc.201600950
日期:2017.1.4
diarylpyridine derivatives obtained was accomplished for the synthesis of novel and biologically relevant trisubstituted pyridines. The formal synthesis of ficuseptine, a bioactive alkaloid, has also been achieved via the palladium‐catalyzed cross‐couplingreaction of 3,5‐dibromo‐2‐tosyloxypyridine in 5 steps from 3,5‐dibromo‐2‐hydroxypyridine with 50% overall yield.
<i>N</i>-Silylenamines as Reactive Intermediates: Hydroamination for the Modular Synthesis of Selectively Substituted Pyridines
作者:Erica K. J. Lui、Daniel Hergesell、Laurel L. Schafer
DOI:10.1021/acs.orglett.8b02703
日期:2018.11.2
modular and selective synthesis of mono-, di-, tri-, tetra-, and pentasubstituted pyridines is reported. Hydroamination of alkynes with N-silylamine using a bis(amidate)bis(amido)titanium(IV) precatalyst furnishes the regioselective formation of N-silylenamines. Addition of α,β-unsaturated carbonyls to the crude mixtures followed by oxidation affords 47 examples of pyridines in yields of up to 96%
A metal-free decarboxylative cyclization from natural α-amino acids to construct pyridine derivatives
作者:Qiang Wang、Changfeng Wan、Yang Gu、Jintang Zhang、Lingfeng Gao、Zhiyong Wang
DOI:10.1039/c0gc00753f
日期:——
A metal-free decarboxylative cyclization from natural α-amino acids was developed and applied in the preparation of pyridinederivatives. By virtue of this method, a series of pyridines containing the moiety of natural α-amino acids can be synthesized efficiently from the corresponding natural α-amino acids.
An oxidative trimerization of three amino acids has been realized to furnish 2,3,5-trisubstuitued pyridines in both cross- and homo-trimerization types. This method is capable of converting simple linear biomass material to heterocycles, which features in the assembly of three amino acid branched chains into one aromatic ring. Molecular iodine triggers the sequential decarboxylation and deamination