Lithium borohydride → 3-(tert-Butyldimethylsilanyloxy)-2-hydroxymethylpyrrolidine-1-carboxylic acid tert-butyl ester

HRID 1965203Notes

Reaction equation

C[O:2][C:3]([CH:5]1[CH:9]([O:10][Si:11]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12])[CH2:8][CH2:7][N:6]1[C:18]([O:20][C:21]([CH3:24])([CH3:23])[CH3:22])=[O:19])=O.[Li+].[BH4-]>C1COCC1.CO>[C:21]([O:20][C:18]([N:6]1[CH2:7][CH2:8][CH:9]([O:10][Si:11]([C:14]([CH3:17])([CH3:16])[CH3:15])([CH3:13])[CH3:12])[CH:5]1[CH2:3][OH:2])=[O:19])([CH3:24])([CH3:23])[CH3:22]

Participants

Conditions

Temperature: 0 °C

Procedure

A solution containing 3-(tert-Butyldimethylsilanyloxy)pyrrolidine-1,2-dicarboxylic acid 1-tert-butyl ester 2-methyl ester (62, 12 g, 33 mmol) in THF (50 mL) was cooled to 0° C. LiBH4 in THF (2M, 20 mL) was added in a dropwise fashion. After 1 h, the solution was warmed to ambient temperature. After 2 h, the solution was diluted with MeOH, then H2O, and concentrated. The residue was extracted with EtOAc, washed with 1M HCl, saturated aqueous NaHCO3, brine, dried over anhydrous Na2SO4, filtered, and concentrated to afford 9.5 g (87%) of 3-(tert-Butyldimethylsilanyloxy)-2-hydroxymethylpyrrolidine-1-carboxylic acid tert-butyl ester (63) as a colorless oil (See: Herdeis, C.; Hubmann, H. P.; Lotter, H. Tetrahedron: Asymmetry, 1994, 5, 119).

Workup

temperaturethe solution was warmed to ambient temperature
waitAfter 2 h
concentrationH2O, and concentrated
extractionThe residue was extracted with EtOAc
washwashed with 1M HCl, saturated aqueous NaHCO3, brine
dry with materialdried over anhydrous Na2SO4
filtrationfiltered
concentrationconcentrated

Sources & evidence

ORD record: ord-ce92f27b43c4443f8e3296138844ac35
Source dataset: uspto-grants-2013_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US08415486B2

Reaction notes

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