Dimethyl Sulfoxide → 3-(tert-Butyldimethylsilanyloxy)-2-formylpyrrolidine-1-carboxylic acid tert-butyl ester

HRID 1014918

Reaktionsgleichung

C(Cl)(=O)C(Cl)=O.CS(C)=O.[C:11]([O:15][C:16]([N:18]1[CH2:22][CH2:21][CH:20]([O:23][Si:24]([C:27]([CH3:30])([CH3:29])[CH3:28])([CH3:26])[CH3:25])[CH:19]1[CH2:31][OH:32])=[O:17])([CH3:14])([CH3:13])[CH3:12]>C(Cl)Cl.Cl>[C:11]([O:15][C:16]([N:18]1[CH2:22][CH2:21][CH:20]([O:23][Si:24]([C:27]([CH3:30])([CH3:29])[CH3:28])([CH3:26])[CH3:25])[CH:19]1[CH:31]=[O:32])=[O:17])([CH3:14])([CH3:13])[CH3:12]

Komponenten

Reaktionsbedingungen

Temperatur: -78 °C

Versuchsvorschrift

A solution containing 2M oxalyl chloride in DCM (22 mL) in DCM (40 mL) was cooled to −78° C. A solution containing DMSO (3.2 mL, 45 mmol) in DCM (20 mL) was added in a dropwise fashion. After 45 min, alcohol 40 (9.5 g, 29 mmol) in DCM (50 mL) was added in a dropwise fashion. After 45 min, TEA (16 mL, 115 mmol) was added in a dropwise fashion. The reaction mixture was warmed and maintained at 0° C. for 15 min. The solution was diluted with 1M HCl, extracted with DCM, washed with brine, dried over anhydrous Na2SO4, filtered, and concentrated to afford 9.5 g (100%) of 41 as a yellow oil. 1H NMR (CDCl3, 300 MHz) δ9.53 (d, J=29 Hz, 1H), 4.39-4.36 (m, 1H), 4.24 (m, rotomer, 0.5H), 3.93 (m, rotomer, 0.5H), 3.73-3.49 (m, 2H), 1.98-1.86 (m, 2H), 1.47 (s, minor rotomer), 1.41 (s, 9H), 0.88 (s, 9H), 0.09 (s, 6H), 0.07 (s, minor rotomer) ppm.

Aufarbeitung

additionwas added in a dropwise fashion
waitAfter 45 min
temperatureThe reaction mixture was warmed
temperaturemaintained at 0° C. for 15 min
extractionextracted with DCM
washwashed with brine
dry with materialdried over anhydrous Na2SO4
filtrationfiltered
concentrationconcentrated

Quellen und Nachweise

ORD-Eintrag: ord-1e5350a2b1ce4d1ca0c7752672164564
Quelldatensatz: uspto-grants-2011_07
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US07985735B2

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