Diisopropylethylamine → 4-(4-Bromo-benzenesulfonyloxy)-1-[2-tert-butoxycarbonylamino-2-(tetrahydro-pyran-4-yl)-acetyl]-pyrrolidine-2-carboxylic acid methyl ester

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	2-(((Tert-butoxy)carbonyl)amino)-2-(oxan-4-yl)acetic acid	HCID 22309198	—
Reactant	L-Proline, 4-[[(4-bromophenyl)sulfonyl]oxy]-, methyl ester, hydrochloride (1:1), (4S)-	HCID 87516774	—
Solvent	Dichloromethane	HCID 6344	—
Product	4-(4-Bromo-benzenesulfonyloxy)-1-[2-tert-butoxycarbonylamino-2-(tetrahydro-pyran-4-yl)-acetyl]-pyrrolidine-2-carboxylic acid methyl ester	HCID 76605064	70.2%

Reaction Steps

To a solution of 4-(4-bromo-benzenesulfonyloxy)-pyrrolidine-2-carboxylic acid methyl ester HCl salt (4 g, 10 mmol) in DCM (50 mL) was added tert-butoxycarbonylamino-(tetrahydro-pyran-4-yl)-acetic acid (2.86 g, 11 mmol), HATU (5.7 g, 15 mmol) and DIPEA (7 mL, 40 mmol). The solution was stirred at room temperature for 16 h. The solution was diluted with DCM and washed twice with aq NH4Cl and brine. The organic layer was dried over MgSO4 and concentrated in vacuo. The desired product was purified by silica gel column chromotography from hexane/EtOAc to provide 4-(4-bromo-benzenesulfonyloxy)-1-[2-tert-butoxycarbonylamino-2-(tetrahydro-pyran-4-yl)-acetyl]-pyrrolidine-2-carboxylic acid methyl ester (4.25 g 70% yield). LCMS found 606 ([M+H]+.

Provenance & Evidence

DOI	10.6084/m9.figshare.5104873.v1
Patent number	US08809267B2
Source dataset	uspto-grants-2014_08
ORD ID	ord-d4b84709605948dfb55f8dc8750544e5
Source note	uspto-grants-2014_08