1,2-Dibromoethane → 9-Acetyl-1,2-dihydro-6-(2-bromoethyl)-cyclopenta[c]carbazole-3-one

Participants

Reaction Steps

NaH (2 g of 60%, 50 mmol) was added to a suspension of compound 91 (4 g, 15.2 mmol) in dry DMF (100 mL), and the mixture was stirred at room temperature about 1 h until the evolution of hydrogen ceased. 1,2-dibromethane (20 g, 106 mmol) was added in dropwise under nitrogen. The reaction mixture was stirred for 30 min at room temperature, then at 60° C. for 24 h, and poured into ice water (300 mL). The precipitated grey solid was filtered off and the crude product purified by column chromatography (CHCl3) to give 2 g of starting material and about 1 g (2.7 mmol, 35.5% from converted material) of the alkylated carbazole 92 as a cream solid.

Provenance & Evidence