Selective Formation of 5- or 6-Membered Rings, 1,3-Thiazolidin-4-one vs. 1,3-Thiazin-4-one, from Acridine Thiosemicarbazides by the Use of Ethyne Acid Esters
作者:Ján Imrich、Jana Tomaščiková、Ivan Danihel、Pavol Kristian、Stanislav Böhm、Karel D. Klika
DOI:10.3987/com-09-s(s)56
日期:——
2-substituted 1-(9,10-dihydroacridin-9-ylidene) thiosemicarbazides 4a-d (H, methyl, ethyl, and n-butyl substituents) were treated with dimethyl acetylenedicarboxylate (DMAD) to yield 5-membered ring 1,3-thiazolidin-4-one products 5a-d. The methyl derivative 4b, upon reaction with methyl propiolate (MP), yielded a 6-membered thiazin-4-one ring product 7b. The structures of the methyl derivative products 5b and
一组 2-取代的 1-(9,10-dihydroacridin-9-ylidene) 氨基硫脲 4a-d(H、甲基、乙基和正丁基取代基)用乙炔二甲酸二甲酯 (DMAD) 处理,得到 5 元环1,3-thiazolidin-4-one 产品 5a-d。甲基衍生物 4b 在与丙炔酸甲酯 (MP) 反应后,产生 6 元噻嗪-4-单环产物 7b。甲基衍生物产物 5b 和 7b 的结构通过核磁共振检查得到了最终证实,并与 X 射线晶体学分析进行了比较。氨基硫脲的环链互变异构、反应的区域选择性和立体选择性、产物Z构型采用的顺顺构象以及所有化合物的原质互变异构都得到了证实。