作者:J.B. Rasmussen、R. Shabana、S.-O. Lawesson
DOI:10.1016/0040-4020(82)80151-8
日期:1982.1
Enamino-thiones 1 prepared from the corresponding enaminones by thiation with Lawesson's Reagent, were allowed to react with 2-chloroacrylonitrile and dimethyl acetylenedicarboxylate giving dihydro-2H-thiopyrans, 2, and 4H-thipyrans, 3, respectively. The reaction of 1a with ethyl propiolate at room temperature afforded 4H-thipyrans, 4a, which on standing rearranged to 2H-thiopyran, 5a(1, 3 amide shift)
由相应的烯胺酮通过用Lawesson's Reagent缩合制备的烯氨基硫酮1与2-氯丙烯腈和乙炔二羧酸二甲酯反应,分别得到二氢2H-硫吡喃2和4H-硫吡喃3。1a与丙酸乙酯在室温下反应,得到4H-噻喃基4a,静置后重排为2H-硫代吡喃5a(1,3酰胺位移)。1b与丙酸乙酯反应生成4b和5b。报道了一些13 C NMR数据。