Triphenylphosphine → (2S)-2-(4-oxo-4H-quinazolin-3-yl)-propionic acid tert-butyl ester

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Reaction Steps

Triphenylphosphine (3.41 g, 13.0 mmol) was added portionwise to a solution of (2S)-2-(N-(2-azido-benzoyl)-N-formylamino)-propionic acid tert-butyl ester (3.437 g, 10.80 mmol) in xylene (70 mL) at room temperature. The reaction mixture was stirred at room temperature until the evolution of nitrogen ceased (approx. 1 h), and then refluxed for 20 h. The volatiles were evaporated and the residue was purified by flash chromatography (30% ethyl acetate in hexane) to afford the sub-title compound as a colorless oil (2.221 g, 75%). 1H NMR (400 MHz C6D6) δ 1.30 (3H, d), 1.34 (9H, s), 4.97 (1H, q), 7.08 (1H, m), 7.31 (1H, m), 7.81 (1H, s), 7.86 (1H, d), 8.55 (1H, m).

Provenance & Evidence