Triacetoxyperiodinane → (3S*,4R*)-3-formyl-4-({isopropyl-[4-methoxy-3-(3-methoxy-propoxy)-benzoyl]-amino}-methyl)-pyrrolidine-1-carboxylic acid tert-butyl ester

Beteiligte Stoffe

Reaktionsschritte

To a well-stirred mixture of (3S*,4R*)-3-hydroxymethyl-4-({isopropyl-[4-methoxy-3-(3-methoxy-propoxy)-benzoyl]-amino}-methyl)-pyrrolidine-1-carboxylic acid tert-butyl ester (600 mg, 1.21 mmol) and Dess-Martin periodinane (272 mg, 1.21 mmol) in CH2Cl2 (10 mL), slowly wet CH2Cl2 (24 μL of water in 2 mL of CH2Cl2) is added. The clear solution becomes cloudy towards the end of wet CH2Cl2 addition. The mixture is diluted with Et2O and concentrated to a few mL of solvent by rotary evaporation. The residue is taken up in Et2O, and washed with a 1:1 10% Na2S2O3/saturated aqueous solution of NaHCO3, followed by H2O and brine. The aqueous washings are back-extracted with Et2O, and this organic layer is washed with H2O and brine. The combined organic layers are dried over Na2SO4, filtered and concentrated under reduced pressure. The crude material is used without further purification in the next step. TLC, Rf (CH2Cl2/MeOH 95:5)=0.3. tR (HPLC, Nucleosil C18 column, 10-100% CH3CN/H2O/5 min, 100% CH3CN/3 min, CH3CN and H2O containing 0.1% TFA, flow: 1.5 ml/min): 5.16 min.

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