Triethylamine → 2-Benzyl-3-cyclobutylisoxazolidin-5-one

N-benzylhydroxylamine hydrochloride (0.77 g, 4.82 mmol) and triethylamine (0.76 mL, 5.45 mmol) were successively added to a solution of (E)-ethyl 3-cyclobutylacrylate, 46a, (0.65 g, 4.19 mmol) in dry dichloromethane (23.5 mL). The reaction mixture was allowed to stir at room temperature under an atmosphere of nitrogen for 3 days. The mixture was diluted with 75 mL of water and the layers were separated. The aqueous phase was reextracted twice more with dichloromethane (50 mL). The combined organic phases were dried over MgSO4, filtered and evaporated to dryness. The residue was purified via silica gel chromatography (0-100% EtOAc/Hexanes gradient) to afford 834 mg (86%) of the desired product: 1H NMR (400 MHz, CDCl3) δ 7.38-7.26 (m, 5H), 4.64 (s, 1H), 3.82 (q, J=13.5 Hz, 2H), 3.37-3.18 (m, 1H), 2.80-2.52 (m, 2H), 2.33 (dd, J=14.5, 5.1 Hz, 1H), 2.22-2.09 (m, 1H), 2.01-1.68 (m, 5H).

1. customthe layers were separated
2. dry with materialThe combined organic phases were dried over MgSO4
3. filtrationfiltered
4. customevaporated to dryness
5. customThe residue was purified via silica gel chromatography (0-100% EtOAc/Hexanes gradient)

ORD-Eintrag

ord-8e8aa95ffb5c430192b7e0bc8045343f

Quelldatensatz

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09051319B2