Abstract
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.
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