β-Carbolines have been prepared by the intramolecular cycloaddition of indole with 1,2,4-triazines tethered from C3 with the indolyl nitrogen using a thiourea linkage. Subsequent to the cycloaddition, reductive cleavage of the thiourea subunit provides the βcarboline.
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Fan et al. (1995) studied this question.
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