Diisopropylethylamine → 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

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Reaction Steps

A racemic mixture of (4R,5S)—N,N-dimethyl-2-(1-oxo-4-phenyl-2,7-diazaspiro[4.5]decan-2-yl)acetamide and (4S,5R)—N,N-Dimethyl-2-(1-oxo-4-phenyl-2,7-diazaspiro[4.5]decan-2-yl)acetamide (Intermediate 1D) (193 mg; 0.612 mmol) was solubilised in acetonitrile (3 ml). (R)-3-Benzyloxy-2-(2-tert-butoxycarbonylamino-2-methylpropionylamino)-propionic acid (Intermediate 3A) (233 mg; 0.612 mmol) was treated with DIPEA (0.427 ml; 2.448 mmol) and ®T3P (50% in EtOAc), (0.714 ml; 1.224 mmol). The mixture was stirred at RT for 2 hours and concentrated in vacuo. The crude residue was solubilised in ethyl acetate and washed with water (3×50 ml). The organics were washed with brine, dried with magnesium sulfate, filtered and concentrated to yield the title compound.

Provenance & Evidence