Nitric Acid → 3-Benzyloxy-4-methoxy-6-nitrobromobenzene

HRID 1582885

Reaktionsgleichung

[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([Br:17])[CH:12]=[CH:13][C:14]=1[O:15][CH3:16])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[N+:18]([O-])([OH:20])=[O:19]>C(O)(=O)C>[CH2:1]([O:8][C:9]1[CH:10]=[C:11]([Br:17])[C:12]([N+:18]([O-:20])=[O:19])=[CH:13][C:14]=1[O:15][CH3:16])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Komponenten

Reaktionsbedingungen

Temperatur: 0 °C

Versuchsvorschrift

3-Benzyloxy-1-bromo-4-methoxybenzene, 36, (1 g, 3.4 mmol) was dissolved in 50 mL acetic acid in a 100 mL round-bottomed flask and cooled to 0° C. using an ice bath. 2.5 mL nitric acid (70%) in 6 mL acetic acid was added dropwise. The reaction mixture was allowed to slowly rise to room temperature. After 3 h no starting material was detected by thin layer chromatography. Evaporation of acetic acid gave the crude product, which was filtered through a short silica gel column using a 80:20 mixture of hexanes:ethyl acetate to give 3-benzyloxy-4-methoxy-6-nitrobromobenzene (1.15 g) in quantitative yield; mp 134-135° C.; IR (KBr) 2946, 1577, 1518, 1468, 1382, 1329, 1266, 1211 cm−1; UV (MeOH) 246, 212 nm (log ε=3.91, 4.13); 1H NMR (CDCl3) δ3.93 (3H, s), 5.19 (2H. s), 7.17 (1H, s), 7.38-7.45 (5H, m), 7.57 (1H, s); 13C NMR δ56.99, 71.98, 107.69, 109.74, 118.73, 127.98, 129.11, 129.36, 135.50, 142.42, 149.18, 152.44; HRMS (EI) calcd for C14H12NO4Br m/z: 336.9950; found: 336.9941.

Aufarbeitung

customto slowly rise to room temperature
customEvaporation of acetic acid
customgave the crude product, which
filtrationwas filtered through a short silica gel column
additiona 80:20 mixture of hexanes

Quellen und Nachweise

ORD-Eintrag: ord-ba93dd929fd0412ab1ce559818e176fd
Quelldatensatz: uspto-grants-2004_05
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US06740650B2

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