Synthesis and Stereochemistry of Thiapyranothiazoles as Diels-Alder Adducts Obtained from Spirodimers of 1,3-Thiazolidines with Cinnamic Acid and its Ester
作者:M. T. Omar、A. El-Khamry、Ali M. Youssef、S. Ramadan
DOI:10.1080/10426500307800
日期:2003.4
Moreover, prolonged heating of either 3b or 3a with ethyl cinnamate gave a mixture contains 40% of 4b and a mixture of 4a and 5a respectively. Furthermore, the dimer 3b reacted with cinnamic acid in glacial acetic acid to give the Diels-Alder-adduct 6b and 7b . Structures and stereo-chemistry of obtained compounds have been studied.
5-Arylmethylene-3-phenyl-2-thioxo-1,3-thiazolidin-4-ones(1a 和 b)与 P 4 S 10 1 或 Lawesson 试剂 2 硫化,主要得到螺二聚体 3'phenyl-2' -thoxo-1',3'-thiazolidino[2,3-d]-spiro[6',7' diaryl-5,5'-perhydrothiapyrano]-3-phenyl-1,3-thiazolidin-4-thiones (3a b)此外,5-(3-溴-4-甲氧基苯基亚甲基)-3-苯基-1,3-噻唑烷-2,4-二硫酮(2b)作为与3b的混合物。使2b与作为亲二烯体的肉桂酸乙酯反应,产生4b和5b。此外,用肉桂酸乙酯长时间加热 3b 或 3a 得到分别含有 40% 4b 的混合物和 4a 和 5a 的混合物。此外,二聚体3b在冰醋酸中与肉桂酸反应,得到第尔斯-