Phosphorus oxychloride → 10-Chloro-5,6,8,9-tetrahydro-1,4,7,10a-tetraaza-cyclohepta[f]indene-7-carboxylic acid benzyl ester

Participants

Reaction Steps

To a suspension of 3.0 g (8.86 mmol) 10-hydroxy-5,6,8,9-tetrahydro-1,4,7,10a-tetraaza-cyclohepta[f]indene-7-carboxylic acid benzyl ester in 6 mL toluene was added 7 mL (74.06 mmol) of phosphorus oxychloride and 1.28 mL (7.35 mmol) of DIPEA, and the reaction was heated at reflux for 40 minutes. The mixture was cooled to room temperature and poured into ice. The aqueous phase was extracted with DCM (3×20 mL) and the combined organic layers were dried over MgSO4. After filtration and evaporation of the solvent the product was purified by column chromatography (silica, heptane/EtOAc 9:1 to 7:3).

Provenance & Evidence