1,1'-Carbonyldiimidazole → (3-{[(1-{[(Tert-butoxycarbonyl)(methyl)amino]methyl}cyclopropyl)carbonyl]amino}-propyl)(triphenyl)phosphonium bromide

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Reaction Steps

1-{[(tert-butoxycarbonyl)(methyl)amino]methyl}cyclopropanecarboxylic acid (680 mg, 3.0 mmol) was dissolved in N,N-dimethylformamide (6.8 mL) and treated with N,N-carbonyldiimidazole (571 mg, 3.52 mmol). The mixture was stirred at room temperature for 30 minutes. To the solution was added (3-ammoniopropyl)(triphenyl)phosphonium dibromide (1.93 g, 4.00 mmol). The mixture was stirred overnight at room temperature and then diluted with methylene chloride and washed with 5% aqueous lithium chloride (3 times), 1N aqueous hydrogen chloride, and saturated sodium bicarbonate. The organic solution was dried over anhydrous sodium sulfate, filtered, and concentrated to give crude title compound. The crude product was purified on a silica gel column eluting with a gradient of 0-20% methanol with methylene chloride to isolate the title compound (810 mg, 40%, 91% pure).

Provenance & Evidence