Dehydrogenation and methylation of 1,2,3,4-tetrahydro-9-methylcarbazoles during Vilsmeier–Haack formylation
Abstract
Formylation of 1,2,3,4-tetrahydro-9-methylcarbazoles under Vilsmeier–Haack conditions affords 3-formyl-1,9-dimethylcarbazoles, in contrast to a previous report.