Trifluoroacetic acid → 2-Amino-N-((2R)-3-(benzyloxy)-1-(2-(2-(dimethylamino)-2-oxoethyl)-1-oxo-4-phenyl-2,7-diazaspiro[4.5]decan-7-yl)-1-oxopropan-2-yl)-2-methylpropanamide

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Reaction Steps

A diasteromeric mixture of tert-butyl 1-((2R)-3-(benzyloxy)-1-(2-(2-(dimethylamino)-2-oxoethyl)-1-oxo-4-phenyl-2,7-diazaspiro[4.5]decan-7-yl)-1-oxopropan-2-ylamino)-2-methyl-1-oxopropan-2-ylcarbamate (386 mg; 0.569 mmol) was solubilised in dichloromethane (3 ml) at room temperature. Trifluoroacetic acid (439 ul; 5.69 mmol) was added and mixture stirred at RT for 72 hours. The solvent was removed in vacuo and the crude product was dissolved in methanol and loaded onto a pre-wetted 10 g SCX-2 cartridge. Methanol (50 ml) was passed through the cartridge and the product was eluted with 2M NH3 in methanol. Concentration of the ammonia fraction afforded the title compound as a diastereomeric mixture. Diastereomers were separated by chiral SFC, collecting the second peak.

Provenance & Evidence