When 2-chloroquinoxaline is treated with a sodium aryloxide in an excess of the corresponding phenol, a mixture of the expected quinoxalinyl ether and the corresponding benzofuro[2,3-b]quinoxaline is obtained. Polyphosphoric acid has been found to be the best reagent for the cyclisation of the isolated quinoxalinyl ethers to the benzofuroquinoxalines.
R. K. Anderson and G. W. H. Cheeseman, J. Chem. Soc., Perkin Trans. 1, 1974, 129 DOI: 10.1039/P19740000129
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