A new route to the versatile synthesis of thiopyrano[2,3-b:6,5-b′]diindoles via 2-(alkylthio)-indole-3-carbaldehydes
作者:Mukund Jha、Michael Edmunds、Kate-lyn Lund、Ashley Ryan
DOI:10.1016/j.tetlet.2014.08.100
日期:2014.10
versatile synthesis of symmetrically and unsymmetrically substituted thiopyrano[2,3-b:6,5-b′]diindoles has been developed by the condensation of 2-(alkylthio)-indole-3-carbaldehydes with indoline-2-thiones in the presence of catalytic amount of ethylenediamine diacetate (EDDA). The EDDA mediated condensation leads to a spontaneous cyclization followed by aromatization to form thiopyrano[2,3-b:6,5-b′]diindoles
通过2-(烷硫基)-吲哚-3-甲醛与二氢吲哚-2-硫酮的缩合反应,已开发出一种通用的对称和不对称取代的噻喃并[2,3- b:6,5- b ']二吲哚化合物。存在催化量的乙二胺二乙酸酯(EDDA)。EDDA介导的缩合导致自发环化,然后进行芳构化,以定量收率形成噻喃并[2,3- b:6,5- b ']二吲哚。