Diisopropylethylamine → (S)-benzyl 1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-4-oxopyrrolidine-2-carboxylate

Participants

Role	Name	HCID	Charge
Reactant	Diisopropylethylamine	HCID 81531	—
Reactant	Methanaminium, N-((dimethylamino)(3H-1,2,3-triazolo(4,5-b)pyridin-3-yloxy)methylene)-N-methyl-, hexafluorophosphate(1-) (1:1)	HCID 9886157	—
Reactant	(2S)-2-((methoxycarbonyl)amino)-3-methylbutanoic acid	HCID 10942966	—
Reactant	HCID 86648889	HCID 86648889	—
Solvent	Dimethylformamide	HCID 6228	—
Solvent	Ethyl Acetate	HCID 8857	—
Product	(S)-benzyl 1-((S)-2-(methoxycarbonylamino)-3-methylbutanoyl)-4-oxopyrrolidine-2-carboxylate	HCID 59610664	—

Reaction Steps

(S)-Benzyl 4-oxopyrrolidine-2-carboxylate hydrochloride (1.92 g, 8.8 mmol), the acid (in this case (S)-2-(methoxycarbonylamino)-3-methylbutanoic acid) (1.84 g, 10.56 mmol) and HATU (5.02 g, 13.2 mmol) were weighed out in a round bottom flask and dissolved in anhydrous DMF (44 mL). To this mixture was added DIPEA (6.82 g, 52.8 mmol) at room temperature and the mixture was stirred for 2 h. The crude mixture was diluted with EtOAc and washed respectively with brine, 10% Na2CO3 and brine again, and the mixture was dried over MgSO4, after filtration the mixture was concentrated down on rotovap. The residue was then purified on normal phase chromatography. (2.45 g, 74%).

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US09156823B2
Source dataset	uspto-grants-2015_10
ORD ID	ord-016791b0d2ba468a9df88eea53375f88
Source note	uspto-grants-2015_10