Benzo[b]thieno[3,2-b]indoles were prepared by reductive cyclisation of 2-aryl-3-nitrobenzo[b]thiophens with triethyl phosphite (TEP) and the parent heterocycle was also obtained from 2-(o-nitrophenyl)benzo[b]thiophen with TEP and by heating 3-azido-2-phenyl- or 2-(o-azidophenyl)benzo[b]thiophen in diglyme.
K. E. Chippendale, B. Iddon and H. Suschitzky, J. Chem. Soc. D, 1971, 203 DOI: 10.1039/C29710000203
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