Acylation of (3H,5H)-tetrahydrothiophene-2,4-dione (thiotetronic acid) with acetyl, propionyl, and valeryl chlorides followed by O-C isomerization in the presence of 4-dimethylaminopyridine or acetone cyanohydrin gave rise to 3-acetyl, 3-propanoyl, and 3-pentanoyl derivatives of thiotetronic acid. The reaction of 3-acylthiotetronic acids with diazomethane afforded enol methyl ethers at the endocyclic keto groups. The subsequent reaction of these enol ethers with allylamine, benzylamine, and p-anisidine occurs along the mechanism of vinylog substitution providing the corresponding endocyclic enamino derivatives.
Process for the production of 4-alkoxy-2(5H) thiophenones
申请人:Lonza Ltd.
公开号:US04906759A1
公开(公告)日:1990-03-06
Process for the production of 4-alkoxy-2(5H) thiophenones, which are suitable as intermediate products, i.e., for the production of highly pure thiotetronic acid.
生产4-烷氧基-2(5H)噻吩酮的过程,这些产品适用作为中间体,即用于生产高纯度噻吩甲酸。
Corral, Carlos; Lissavetzky, Jaime, Journal of the Chemical Society. Perkin transactions I, 1984, p. 2711 - 2714
作者:Corral, Carlos、Lissavetzky, Jaime
DOI:——
日期:——
SAITO KIMITOSHI; SATO TADASHI, BULL. CHEM. SOC. JAP., 1979, 52, NO 12, 3601-3605,
作者:SAITO KIMITOSHI、 SATO TADASHI
DOI:——
日期:——
MEUL, THOMAS
作者:MEUL, THOMAS
DOI:——
日期:——
CORRAL, C.;LISSAVETZKY, J., J. CHEM. SOC. PERKIN TRANS., 1984, N 12, 2711-2714