Water → 1-(3-methoxypropyl)-6-nitro-1H-indazole

HRID 660364

Reaktionsgleichung

[N+:1]([C:4]1[CH:12]=[C:11]2[C:7]([CH:8]=[N:9][NH:10]2)=[CH:6][CH:5]=1)([O-:3])=[O:2].CS(O[CH2:18][CH2:19][CH2:20][O:21][CH3:22])(=O)=O.C([O-])([O-])=O.[K+].[K+].O>CC#N>[CH3:22][O:21][CH2:20][CH2:19][CH2:18][N:10]1[C:11]2[C:7](=[CH:6][CH:5]=[C:4]([N+:1]([O-:3])=[O:2])[CH:12]=2)[CH:8]=[N:9]1

Komponenten

Reaktionsbedingungen

Temperatur: 60 °C

Versuchsvorschrift

A mixture of 6-nitro-1H-indazole (50 g, 0.307 mol), 3-methoxypropyl methanesulfonate (54.3 g, 0.323 mol) and K2CO3 (127 g, 0.921 mol) in CH3CN (1.5 L) was heated at 60° C. overnight. Water (1 L) was added and the CH3CN was removed under reduced pressure and the aqueous residue was extracted with EtOAc (3×500 mL). The combined organic extracts were washed with brine, dried over Na2SO4, filtered and concentrated. The residue was purified by column chromatography on silica gel to give 1-(3-methoxypropyl)-6-nitro-1H-indazole (33 g, 46% yield). 1H NMR (400 MHz, CDCl3): δ8.47 (s, 1H), 8.13 (s, 1H), 8.01-7.99 (dd, J=8.8, 2.0 Hz, 1H), 7.83-7.81 (d, J=8.8 Hz, 1H), 4.61-4.57 (t, J=6.4 Hz, 2H), 3.29 (s, 3H), 3.26-3.23 (t, J=5.6 Hz, 2H), 2.23-2.17 (m, 2H).

Aufarbeitung

customthe CH3CN was removed under reduced pressure
extractionthe aqueous residue was extracted with EtOAc (3×500 mL)
washThe combined organic extracts were washed with brine
dry with materialdried over Na2SO4
filtrationfiltered
concentrationconcentrated
customThe residue was purified by column chromatography on silica gel

Quellen und Nachweise

ORD-Eintrag: ord-aa78929fb88d4d59b52175c62d3f59eb
Quelldatensatz: uspto-grants-2011_12
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US08084485B2

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