Phosphorus oxychloride → 7-bromo-4-chloro-2-(4-piperidyl)-5H-pyrimido[5,4-b]indole

Participants

Reaction Steps

650 mg (1.90 mmol) 7-bromo-2-(4-piperidyl)-5H-pyrimido[5,4-b]indol-4-ol were kept at reflux in POCl3 for 9 h. Then, POCl3 was removed in vacuo, the residue was mixed with water and neutralized with NaHCO3. The precipitate formed was sucked off and washed with water. 500 mg (72%) 7-bromo-4-chloro-2-(4-piperidyl)-5H-pyrimido[5,4-b]indole was obtained. ESI-MS [m/z]: 365, 367 [M+H]+

Provenance & Evidence