Hydrochloric Acid → 4-Methoxybenzyl 1-[di(methoxycarbonyl)methyl]-4-nitronaphthalene-2-carboxylate

HRID 366799Notes

Reaction equation

HRID 366799 reaction equation
[N+:1]([C:4]1[C:13]2[C:8](=[CH:9][CH:10]=[CH:11][CH:12]=2)[C:7](OS(C(F)(F)F)(=O)=O)=[C:6]([C:22]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][C:29]([O:32][CH3:33])=[CH:28][CH:27]=2)=[O:23])[CH:5]=1)([O-:3])=[O:2].[C:34]([O:41][CH3:42])(=[O:40])[CH2:35][C:36]([O:38][CH3:39])=[O:37].C([O-])([O-])=O.[K+].[K+].Cl>CN(C=O)C.C(Cl)Cl>[CH3:39][O:38][C:36]([CH:35]([C:34]([O:41][CH3:42])=[O:40])[C:7]1[C:8]2[C:13](=[CH:12][CH:11]=[CH:10][CH:9]=2)[C:4]([N+:1]([O-:3])=[O:2])=[CH:5][C:6]=1[C:22]([O:24][CH2:25][C:26]1[CH:31]=[CH:30][C:29]([O:32][CH3:33])=[CH:28][CH:27]=1)=[O:23])=[O:37]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 7943Dimethyl malonateHCID 11430Potassium CarbonateHCID 105529114-Methoxybenzyl 4-nitro-1-trifluoromethylsulfonyloxynaphthalene-2-carboxylate

Product 1

HCID 108140884-Methoxybenzyl 1-[di(methoxycarbonyl)methyl]-4-nitronaphthalene-2-carboxylateYield 84%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 6344DichloromethaneSolvent

Conditions

Temperature
20 °C

Procedure

A stirred solution of 4 (13.20 g, 27.2 mmol) and dimethyl malonate (5.39 g, 40.8 mmol) in DMF (85 mL) was cooled to -5° C. and treated with powdered K2CO3 (22.53 g, 163 mmol). The mixture was allowed to warm to 20° C. over a 2 h period, and after stirring for a further 12 h at 20° C. was poured slowly into cold stirred 0.5N HCl (1750 mL). The resulting solid was dissolved in CH2Cl2 and the solution was washed twice with water, dried (Na2SO4) and then evaporated to dryness. The residue was crystallised from CH2Cl2 /iPr2O/petroleum ether to give 4-methoxybenzyl 1-[di(methoxycarbonyl)methyl]-4-nitronaphthalene-2-carboxylate (5) (10.66 g, 84%), suitable for further use. A sample recrystallised from MeOH had mp 124-125° C. 1H NMR (CDCl3) δ 8.62 (s, 1H, H-3), 8.45 (d, J=8.6 Hz, 1H, H-5), 8.21 (d, J=8.7 Hz, 1H, H-8), 7.70 (br t, J=7.7 Hz, 1H, H-6), 7.69 (br t, J=7.8 Hz, 1H, H-7), 7.41 (d, J=8.7 Hz, 2H, H-2',6'), 6.94 (d, J=8.7 Hz, 2H, H-3',5'), 6.62 (s, 1H, ArCH), 5.37 (s, 2H, CH2), 3.83 (s, 3H, PhOCH3), 3.69 (s, 6H, 2×CO2CH3). Anal. Calculated for C24H21NO9 : C, 61.6; H, 4.7; N, 3.1%.

Workup

  1. additionwas poured slowly
  2. washthe solution was washed twice with water
  3. dry with materialdried (Na2SO4)
  4. customevaporated to dryness
  5. customThe residue was crystallised from CH2Cl2 /iPr2O/petroleum ether

Sources & evidence

ORD record
ord-24c1e6a23edb4edc8c13a6859adee799
Source dataset
uspto-grants-2000_10
Patent number
US06130237

Reaction notes

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