Water → N-benzyl-N-(tert-butoxycarbonyl)-L-phenylalaninal

Participants

Reaction Steps

To a solution of 2.38 g(6.98 moles) of N-(t-butoxycarbonyl)-N-benzyl-L-phenylalaninol from Example 11 in 3.8 mL (27.2 mmoles) of triethylamine at 10° C. was added a solution of 4.33 g (27.2 mmoles) of sulfur trioxide pyridine complex in 17 mL of dimethyl sulfoxide. The mixture was warmed to room temperature and stirred for one hour. Water (16 mL) was added and the mixture was extracted with 20 mL of ethyl acetate. The oragnic layer was washed with 20 mL of 5% citric acid, 20 mL of water, 20 mL of brine, dried over magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to give 2.37 g 100% yield) of N-(t-Butoxycarbonyl)-N-benzyl-L-phenylalaninal.

Provenance & Evidence