Synthesis and Neurotropic Activity of 4-Phenylpyridine-3-Carboxylic Acid and 3-Hydroxy-4-Phenylthieno[2,3-b]-Pyridine Derivatives
作者:E. G. Paronikyan、A. V. Ogannisyan、R. G. Paronikyan、I. A. Dzhagatspanyan、I. M. Nazaryan、A. G. Akopyan、N. S. Minasyan
DOI:10.1007/s11094-019-1911-0
日期:2019.1
Aseries of pyridine-3-carboxylic acid derivatives were synthesized via recyclization of a thiopyran ring using cyclic secondary amines and then converted into substituted thieno[2,3-b]pyridines. Studies of the neurotropic properties identified several synthesized compounds with anticonvulsant activity against corazole-induced seizures. The compounds were active as psychological sedatives and, in contrast
Gewald,K. et al., Journal fur praktische Chemie (Leipzig 1954), 1973, vol. 315, p. 679 - 689
作者:Gewald,K. et al.
DOI:——
日期:——
Darstellung und Reaktionen von 2-Mercapto-6-thioxo-thiopyran-3-carbons�ure-Derivaten
作者:M. Rehwald、H. Sch�fer、K. Gewald、M. Gruner
DOI:10.1002/prac.19963380198
日期:——
6-Amino-thiopyran-2-thiones (1) react with dihydrogen sulfide in the presence of pyridine and triethyl amine to yield 6-thioxo-thiopyran-2-thiolates (2). Methylation of 2 gives the methylthio compounds 3 and 4. Further methylation of 3a and 4a yields the thiapyrylium salt (7). The reaction of 2-imino-thiopyran (6) with carbon disulfide represents another route to the 6-methylthio-thiopyran-2-thione (4a). The 2-methylthio-thiopyran-6-thione (3a) undergoes substitution of the methylthio group with amines to 8 or reacts with phenylhydrazine to phenylhydrazono-thiopyrane (9c). 6-Thioxo-thiophen-2-thiolates (2a,b) react with hydrazine hydrate to give hydrazono-thiopyranes (10a,b) which can be S-methylated. On the contrary 2c gives with hydrazine hydrate under ring transformation the pyridine-2-thiolate (11). N,S-Acetals (12) and 1,3,4-thiadiazoles (15), which give rise to new pyridine derivatives (14) and (17), can be obtained from 1-Amino-pyridin-2-thiolate (11).
MOLINA, PEDRO;TARRAGA, ALBERTO;GARCIA, CONCEPCION, HETEROCYCLES, 27,(1988) N 3, C. 733-743