nuclei simultaneously. From N-(prop-2-yn-1-yl)-o-phenylenediamines containing an aryl substituent at the triple bond, and N-(penta-2,4-diyn-1-yl)-o-phenylenediamines 2-methylidene-2,3-dihydro[1,3]thiazolo[3,2-a]benzimidazoles are formed. The latter are readily isomerized under the action of base giving thiazolo[3,2-a]benzimidazoles. The cyclocondensation of N-(alk-2-yn-1-yl)-o-phenylenediamines with
N-(prop-2-yn-1-yl)-o-
苯二胺与异
硫氰酸苯酯的环缩合导致1-(prop-2-yn-1-yl)-1,3-dihydro-2H-的形成
苯并咪唑-2-
硫酮与三键的取代基性质无关。在KOH存在下,
邻苯二胺的单炔和二炔衍
生物与
二硫化碳的反应同时进行两个杂环核的形成。由在三键处包含芳基取代基的N-(丙-2-炔-1-基)-
邻苯二胺和N-(戊-2,4-二炔-1-基)-
邻苯二胺2-亚甲基形成了-
2,3-二氢[1,3]噻唑并[3,2-a]苯并咪唑。后者在碱的作用下容易异构化,得到
噻唑并[3,2-a]
苯并咪唑。N-(alk-2-yn-1-yl)-o-
苯二胺与CS 2的环缩合 导致[1,3]
噻嗪[3,2-a]
苯并咪唑。