Hydroxyamine hydrochloride → 1-Hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehyde oxime

To a solution of 1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehyde (10 mg, 0.053 mmol) and NH2OH.HCl (4.4 mg, 0.063 mmol) in THF (4 mL) and H2O (1 mL) at rt was added NaOAc (6 mg, 0.074 mmol). The reaction mixture was stirred for 3 h and diluted with H2O. The mixture was extracted with EA and the organic layer was separated. The organic solution was washed with brine, dried over Na2SO4, filtered and concentrated under reduced pressure. The residue was purified by prep-TLC to provide 1-hydroxy-3,3-dimethyl-1,3-dihydrobenzo[c][1,2]oxaborole-5-carbaldehyde oxime (8 mg; yield 74%) as a colorless oil. 1H NMR (400 MHz, CDCl3): δ 8.23 (s, 1 H), 7.76 (d, J=7.6 Hz, 1 H), 7.55 (m, 2 H), 2.81 (s, 1 H,), 1.61 (s,6 H) ppm.

1. extractionThe mixture was extracted with EA
2. customthe organic layer was separated
3. washThe organic solution was washed with brine
4. dry with materialdried over Na2SO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by prep-TLC

ORD-Eintrag

ord-4cc85f5108aa47df804cf410f1933c7e

Quelldatensatz

uspto-grants-2015_10

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09156860B2