[EN] SUBSTITUTED 1H-PYRIDINE-2-ONE DERIVATIVES<br/>[FR] DERIVES DE 1H-PYRIDINE-2-ONE SUBSTITUEE
申请人:C & C RES LAB
公开号:WO2004050624A1
公开(公告)日:2004-06-17
The present invention relates to substituted 1H-pyridine-2-one derivatives of formula (1) and pharmaceutically acceptable salts thereof, which are useful for the treatment of chronic obstructive pulmonary disease, asthma, chronic bronchitis, psoriasis, ulcerative colitis, Crohn's disease (local ileitis), arteriosclerosis, rheumatoid arthritis, osteoporosis, bone arthritis, depression, memory loss, inflammation mediated by chronic necrosis and the others mediated by PDE4: (I)
N-Heterocyclic Carbene-Catalyzed Annulation of Ylides with Ynals: Direct Access to α-Pyrones
作者:Ming Lang、Qianfa Jia、Jian Wang
DOI:10.1002/asia.201800595
日期:2018.9.4
We herein report an N‐HeterocyclicCarbene (NHC)‐catalyzed annulation of ylides with ynals that provides an efficient protocol to make 4,6‐disubstituted α‐pyrones. This method affords a variety of α‐pyrones in good to high yields as well as broad substrate scope and good functional group tolerance.
Unexpected reactivity of pyridinium salts toward alkynyl Fischer complexes to produce<i>oxo</i>‐heterocycles
作者:María Inés Flores‐Conde、Fabiola N. Cruz、Julio López、J. Óscar C. Jiménez‐Halla、Eduardo Peña‐Cabrera、Marcos Flores‐Álamo、Francisco Delgado、Miguel A. Vázquez
DOI:10.1002/aoc.4202
日期:2018.3
The unprecedented reaction of ketone‐containing aromatic pyridiniumsalts 3a‐e and alkynylFischercomplexes 1a‐f proceeds via a mild domino process to provide 4,6‐disubstituted pyran‐2‐ones 5a‐k and 2,3,5‐trisubstituted furans 6a‐h (45‐97%). According of the results of isotopic labeling experiments, a mechanism involving an initial Michael addition appears to be the key step, obtaining a mesomeric