The synthesis of 1-methyl-3,4-dihydro-β-carboline (harmalan) and of two of its derivatives by dehydration of the corresponding 1-hydroxymethyl-1,2,3,4-tetrahydro-β-carbolines is described. Harmalan was also obtained by oxidative decarboxylation of 1-methyl-1,2,3,4-tetrahydro-β-carboline-1-carboxylic acid.
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Ian D. Spenser (1959) studied this question.
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