[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)
A general and efficient lactonization method of readily available 2-alkynylbenzoates affording biologically important isochromenones has been realized via a solely BF3 center dot Et2O-mediated 6-endo-dig cyclization process under mild conditions. An alternative mechanistic pathway in which BF3 center dot Et2O activates the carbonyl of the ester moiety, rather than the alkyne triple bond, was postulated on the basis of control experiment results. Gram-scale reaction and further application for the assembly of more complex molecules demonstrated the practicability of the protocol.
NAGARAJAN, A.;BALASUBRAMANIAN, TIRUVENKAT R., INDIAN J. CHEM., 26,(1987) N 10, 917-919
作者:NAGARAJAN, A.、BALASUBRAMANIAN, TIRUVENKAT R.
DOI:——
日期:——
Synthesis of 3-arylisocoumarins, including thunberginols A and B, unsymmetrical 3,4-disubstituted isocoumarins, and 3-ylidenephthalides via iodolactonization of methyl 2-ynylbenzoates or the corresponding carboxylic acids
carboxylic acids, were used as precursors either to 3-arylisocoumarins, including naturally-occurring thunberginols A and B, or to unsymmetrical 3,4-disubstituted isocoumarins. On the other hand, (Z)- and (E)-3-iodomethylidenephthalides, which were regioselectively prepared by iodolactonization of methyl 2-ethynylbenzoate, were employed as starting materials for the stereospecific synthesis of (Z)- and