Acetic Acid → (3R,4S)-1-Benzyl-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-3-carboxylic acid

HRID 445994Notes

Reaction equation

[C:1]([O:5][C:6](=[O:17])[CH2:7][C@@:8]1([C:14]([OH:16])=[O:15])[C@H:12]([CH3:13])[CH2:11][NH:10][CH2:9]1)([CH3:4])([CH3:3])[CH3:2].[CH:18](=O)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.C(O)(=O)C.C(O[BH-](OC(=O)C)OC(=O)C)(=O)C.[Na+]>CO>[CH2:18]([N:10]1[CH2:11][C@@H:12]([CH3:13])[C@@:8]([CH2:7][C:6]([O:5][C:1]([CH3:2])([CH3:3])[CH3:4])=[O:17])([C:14]([OH:16])=[O:15])[CH2:9]1)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1

Participants

Conditions

Temperature: 40 °C

Procedure

A mixture of (3R*,4S*)-3-[2-(tert-butoxy)-2-oxoethyl]-4-methylpyrrolidine-3-carboxylic acid obtained in Example 1i (1.8 g, 7.4 mmol), benzaldehyde (1.51 ml, 14.8 mmol), acetic acid (0.635 ml, 11.1 mmol), sodium triacetoxyborohydride (3.14 g, 14.8 mmol) and methanol (35 ml) was heated at 40° C. for 38 hours and 30 minutes. The reaction mixture was concentrated, and the resulting residue was purified by silica gel column chromatography (ODS silica gel, elution solvent: water/methanol) to give the title compound as Lot A (584 mg) and Lot B (708 mg).

Workup

concentrationThe reaction mixture was concentrated
customthe resulting residue was purified by silica gel column chromatography (ODS silica gel, elution solvent: water/methanol)

Sources & evidence

ORD record: ord-464a3000b52f4914844ffab09ebbeeec
Source dataset: uspto-grants-2013_07
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08476301B2

Reaction notes

Loading…