Triphenylphosphine → 6-[2-(1-Methyl-pyrrolidin-2-yl)-ethoxy]-quinoline-2-carboxylic acid ethyl ester

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A mixture of 0.400 g (0.002 mol) of 6-hydroxy-quinoline-2-carboxylic acid ethyl ester, 0.966 g (0.004 mmol) of triphenylphospine (Fluka), 0.396 g (0.003 mmol) of 1-methyl-2-pyrrolidineethanol and 0.68 ml (0.004 mmol) di-tert.-butyl azadicarboxylate 40% in toluene in 40 ml THF was stirred for a prolonged period of time at 35° C. The mixture was filtered through a pad of silica and washed with 30 ml THF. The mixture was evaporated to dryness and purified on silica eluting with a gradient of DCM/MeOH/NH4OH from 97/3/0.5 to 90/10/0.5. The ]

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