Triacetoxyperiodinane → (S)-4-[2-(3-fluoro-2-methyl-benzyl)-1-phenyl-indolizine-3-carbonyl]-2-(2-oxo-ethyl)-piperazine-1-carboxylic acid tert-butyl ester

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Reaction Steps

To a solution of the compound of example 5, step 5 (0.955 g, 1.67 mmol) in 10 ml of DCM under argon was added 1,1,1-triacetoxy-1,1-dihydro-1,2-benziodoxol-3(1H)-one (7.78 g, 1.84 mmol). The mixture was stirred at room temperature for 3.5 h and then diluted with 40 ml of diethyl ether. The solution was washed three times with a 1 N solution of sodium hydroxide (15 ml) and twice with brine (15 ml). The organic phase was dried over sodium sulfate, filtered and evaporated to dryness under reduced pressure to give 0.965 g of the title compound as a green powder which was directly used in the next step.

Provenance & Evidence