Simple and efficient one‐pot synthesis of 3,4‐dihydro‐2‐pyridones via solid‐supported Bi(III)nitrate catalyzed double michael addition‐azaannulation
摘要:
Abstractmagnified image4‐Aryl‐5‐carboethoxy‐6‐methyl‐2,3‐dihydro‐2‐pyridones were obtained, in high yield, by heating ternary mixtures of appropriate aldehydes, ethylacetoacetate and compounds possessing NH2‐C=X functionality, in presence of immobilized Bi(III)nitrate and co‐catalyst Zn(II)chloride, under solventless conditions. The reaction proceeds smoothly at 140±5°C and seems to involve double Michael addition‐azaannulation.
High-throughput preparation of alkyl 4-aryl substituted-2-methyl-6-thioxo-1,4,5,6-tetrahydropyridine-3-carboxylates under microwave irradiation
作者:Hortensia Rodríguez、Julieta Coro、Anabel Lam、Esperanza Salfrán、Javier Rodríguez-Salarichs、Margarita Suárez、Fernando Albericio、Nazario Martin
DOI:10.3998/ark.5550190.0012.909
日期:——
An efficient high-throughput synthesis of 4-aryl substituted 1,4,5,6-tetrahydro-2-methyl-6thioxopyridine-3-carboxylates 5a-p was developed by using Lawesson’s reagent, a very effective thionating reagent for carbonyl compounds, under conventional conditions and microwaveirradiation. In order to gain a better understanding of the structure of the heterocycles obtained, theoretical calculations at the
Steric and electronic substitution effects on the thermal oxidation of 5-carboethoxy-2-oxo-1,2,3,4-tetrahydropyridines
作者:Hamid Reza Memarian、Mahdieh Kalantari
DOI:10.1007/s13738-016-0966-z
日期:2017.1
by the hydroxyl radical formed in situ is occurred in the rate determining step, which is influenced by the steric and electroniceffects of the substituted aryl group attached to this atom and also the stability of the radical intermediate involved in the oxidation reaction. The experimental results were supported by the computational studies.