Inverse Electron Demand Diels-Alder Reactions of Indole IV. A New Route to β-Carbolines

Article abstract of DOI:10.1016/00404-0399(50)1347K-

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 β-carboline.