Efficient Synthesis of Functionalized 2 H-Thiopyrans via Hetero- Diels- Alder Reactions of an Enaminothione with Electrophilic Olefins
作者:Krystyna Bogdanowicz-Szwed、Artur Budzowski
DOI:10.1007/s007060170057
日期:2001.8
as well as maleic and fumaric acids (dienophiles) yielded 3,4-dihydro-2 H -thiopyran derivatives. The treatment of some of those cycloadducts with acetic acid caused elimination of dimethylamine, affording stable 2 H -thiopyrans. A reaction of the diene with maleic anhydride furnished a cycloadduct which underwent spontaneous rearrangement to form an N,N-dimethylamide derivative. Cycloadditions of the
3-二甲基氨基-1-(2-噻吩基)-2-丙烯-1-硫酮(二烯)与取代的β-硝基苯乙烯以及马来酸和富马酸(二烯亲和物) 的异 Diels - Alder 反应产生3,4 -二氢-2 H- 硫代 吡喃衍生物。用乙酸处理某些环加合物可消除二甲基胺,提供稳定的2 H -硫吡喃。二烯与马来酸酐的反应提供了自发的重排以形成N,N-二甲基酰胺衍生物的环加合物。在乙酸酐存在下进行二烯与马来酰亚胺,N-苯基马来酰亚胺,马来酸单苯胺,马来酸二乙酯,富马酸酯和丁烯内酯的环加成反应,然后在形成稳定的2 H- 噻喃衍生物的情况下消除二甲胺 。