Diisopropylethylamine → tert-butyl 4-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinecarbonyl)piperidine-1-carboxylate

Temperatur

0 °C

HATU (3.3 g, 8.7 mmol) and tert-butyl 4-(hydrazinecarbonyl)piperidine-1-carboxylate (2.29 g, 9.42 mmol) were added to a solution of (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carboxylic acid (2.0 g, 7.25 mmol) in CH2Cl2 (50 mL) at 0° C. DIPEA (2.8 g, 21.8 mmol) was then added and the reaction mixture was stirred at 0° C. for 12 hrs. The reaction mixture was then washed with water and saturated sodium chloride and dried over Na2SO4 and concentrated. The residue was purified by silica gel column chromatography (10:1 DCM/MeOH) to give tert-butyl 4-(2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diaza-bicyclo[3.2.1]octane-2-carbonyl)hydrazinecarbonyl)piperidine-1-carboxylate (2.2 g, 62%) as a white solid. ESI-MS (EI+, m/z): 502.2 [M+H]+.

1. washThe reaction mixture was then washed with water and saturated sodium chloride
2. dry with materialdried over Na2SO4
3. concentrationconcentrated
4. customThe residue was purified by silica gel column chromatography (10:1 DCM/MeOH)

ORD-Eintrag

ord-6c64959f6f1241bd86fb1ddb72ce1f44

Quelldatensatz

uspto-grants-2015_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08969570B2