tert-butyl (R)-2-[6-bromo-3-bis-(tert-butoxycarbonyl)amino-2-methoxycarbonylphenoxymethyl]pyrrolidine-1-carboxylate → methyl 6-amino-3-bromo-2-((R)-1-pyrrolidin-2-ylmethoxy)benzoate

Participants

Reaction Steps

A solution of tert-butyl (R)-2-[6-bromo-3-bis-(tert-butoxycarbonyl)amino-2-methoxycarbonylphenoxymethyl]pyrrolidine-1-carboxylate (Intermediate 8, 3.15 g) in TFA (20 mL) and DCM (20 mL) was stirred at room temperature for 1 hour. The mixture was concentrated in vacuo and the residue was dissolved in ethyl acetate and washed with aqueous potassium carbonate solution. The aqueous layer was extracted with ethyl acetate, dried (Na2SO4) and filtered. The filtrate was concentrated in vacuo to give methyl 6-amino-3-bromo-2-((R)-1-pyrrolidin-2-ylmethoxy)benzoate (1.65 g) as a colourless gum.

Provenance & Evidence