INTRAMOLECULAR DIELS-ALDER CYCLOADDITIONS OF VINYLKETENIMINES. A CONVERGENT ROUTE TO CARBAZOLES AND PYRIDOCARBAZOLE ALKALOIDS

Article abstract of DOI:10.1016/S0040-4039(00)98574-5

The intramolecular Diels-Alder cycloaddition of acetylenic vinylketenimines is the key step of a highly convergent synthesis of carbazoles.A facile synthesis of N-methyl-tetrahydroellipticine has been completed in five isolated steps from N-methyl piperidone.