Nitric Acid → Acetic acid 7-benzyloxy-6-nitro-1,2,3,4-tetrahydronaphthalen-2-yl ester

HRID 643904

Reaction equation

HRID 643904 reaction equation
[CH2:1]([O:8][C:9]1[CH:18]=[C:17]2[C:12]([CH2:13][CH2:14][CH:15]([O:19][C:20](=[O:22])[CH3:21])[CH2:16]2)=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[N+:23]([O-])([OH:25])=[O:24]>CC(O)=O.OS(O)(=O)=O.O.[N+]([O-])([O-])=O.[Cu+2].O.O.O.O.[N+]([O-])([O-])=O.[Cu+2].[N+]([O-])([O-])=O.[N+]([O-])([O-])=O>[CH2:1]([O:8][C:9]1[CH:18]=[C:17]2[C:12]([CH2:13][CH2:14][CH:15]([O:19][C:20](=[O:22])[CH3:21])[CH2:16]2)=[CH:11][C:10]=1[N+:23]([O-:25])=[O:24])[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1

Participants

6

Reactant 2

HCID 944Nitric AcidHCID 66750626Acetic acid 7-benzyloxy-1,2,3,4-tetrahydronaphthalen-2-yl ester

Product 1

HCID 66750447Acetic acid 7-benzyloxy-6-nitro-1,2,3,4-tetrahydronaphthalen-2-yl ester

Reagents, catalysts & solvents 3

HCID 1118Sulfuric AcidCatalystHCID 167780Copper(II) nitrate hemipentahydrateCatalystHCID 176Acetic AcidSolvent2×

Procedure

To a solution of acetic acid 7-benzyloxy-1,2,3,4-tetrahydronaphthalen-2-yl ester (5.77 g, 19.5 mmol) in AcOH (30 mL) is added a solution of 90% HNO3 (3.0 mL, ca. 64 mmol) in AcOH (5 mL), copper(II) nitrate hemipentahydrate (3.71 g, 19.8 mmol) and conc. H2SO4 (3 drops) at room temperature. The mixture is stirred at room temperature for 1.5 h and partitioned between EtOAc and aq. KOH. The organic layer is dried over MgSO4, concentrated and chromatographed to afford acetic acid 7-benzyloxy-6-nitro-1,2,3,4-tetrahydronaphthalen-2-yl ester with some impurities. Crystallization from DCM-hexanes yields a precipitate, which is quickly rinsed with Et2O-hexanes to afford pure acetic acid 7-benzyloxy-6-nitro-1,2,3,4-tetrahydro-naphthalen-2-yl ester: 1H NMR (CDCl3) δ 7.66 (s, 1H), 7.48-7.29 (m, 5H), 6.80 (s, 1H), 5.22-5.15 (m, 1H), 5.19 (s, 2H), 3.10 (dd, J=16.0, 8.0 Hz, 1H), 2.95-2.72 (m, 3H), 2.05 (s, 3H), 2.05-1.95 (m, 2H).

Workup

  1. custompartitioned between EtOAc and aq. KOH
  2. dry with materialThe organic layer is dried over MgSO4
  3. concentrationconcentrated
  4. customchromatographed

Sources & evidence

ORD record
ord-10a7cfaa50044216a5f6aa06487b5c1a
Source dataset
uspto-grants-2010_04
Patent number
US07700633B2

Linked notes

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