Tetrabutylammonium Fluoride → (2R,5R)-5-hydroxymethyl-2-{2-[2-((S)-2-methoxycarbonylamino-3,3-diphenyl-propionylamino)-phenyl]-ethyl}-morpholine-4-carboxylic acid tert-butyl ester

Participants

Reaction Steps

To tert-butyl (2R,5S)-5-({[tert-butyl(dimethyl)silyl]oxy}methyl)-2-[2-(2-{[N-(methoxycarbonyl)-β-phenyl-L-phenylalanyl]amino}phenyl)ethyl]morpholine-4-carboxylate in THF (0.1 M) at rt was added TBAF (1M in THF) (4 eq.). The mixture was stirred at rt for 2 hrs, diluted with EtOAc and saturated aqueous NH4Cl and the aqueous layer was extracted with EtOAc. The combined organic layers were washed with brine, dried over Na2SO4, filtered and concentrated. The crude product was purified by automated SiO2 flash chromatography system using solvent gradient of 0-5% MeOH/CH2Cl2 to afford the desired compound.

Provenance & Evidence