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.
STACHEL, HANS-DIETRICH;FENDL, ANTON, ARCH. PHARM., 321,(1988) N 7, 439-440
作者:STACHEL, HANS-DIETRICH、FENDL, ANTON
DOI:——
日期:——
Novel synthesis and γ-alkylation reactions of 4-(1-pyrrolidinyl)-2(5H)-thiophenones
作者:Yu-Jang Li、Zen-Ting Liu、Sheng-Chuan Yang
DOI:10.1016/s0040-4039(01)01705-1
日期:2001.11
Four-step synthesis of achiral and chiral 4-(1-pyrrolidinyl)-2(5H)-thiophenones with 61 and 66% overall yields are described. The γ-alkylation reaction studies and synthetic applications toward the thiolactomycin analog are also reported.