A new route to the versatile synthesis of thiopyrano[2,3-b:6,5-b′]diindoles via 2-(alkylthio)-indole-3-carbaldehydes
2014
Abstract A 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 in quantitative yields.
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