Piperidine → [4-(1H-indol-3-ylmethylene)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-acetic acid tert-butyl ester

Participants

Reaction Conditions

Reaction Steps

To a solution of (5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl)-acetic acid tert-butyl ester (Preparation 13(B)) (3.66 g, 9.37 mmol) in toluene (94 mL) was added 1H-indole-3-carbaldehyde (1.63 g, 11.2 mmol) and piperidine (2.78 mL, 28.1 mmol). The reaction was heated to 110° C. in a Soxhlet for 10 hours and was stirred at room temperature for 24 hours. The precipitate was filtered and was washed with toluene to provide 6.47 g of [4-(1H-indol-3-ylmethylene)-5-oxo-1-phenyl-4,5-dihydro-2,3,6,10b-tetraaza-benzo[e]azulen-6-yl]-acetic acid tert-butyl ester. MS 518.5 (M+1).

Provenance & Evidence