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CAS No. : | 108763-41-3 | MDL No. : | MFCD06496141 |
Formula : | C12H14N2O4 | Boiling Point : | - |
Linear Structure Formula : | - | InChI Key : | - |
M.W : | 250.25 | Pubchem ID : | - |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P501-P270-P264-P280-P302+P352-P337+P313-P305+P351+P338-P362+P364-P332+P313-P301+P312+P330 | UN#: | |
Hazard Statements: | H302-H315-H319 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium periodate; water; In tetrahydrofuran; at 20 - 40℃; | Step 2: 3-Formyl-4-nitro-benzoic acid methyl ester (Compound 4); [0216] Compound 3 (11. 81G 47.2 mmol) and NAI04 (30.3 g 141.6 mmol) was dissolved in 250 mL THF/H2O 1: 1 at room temperature. The dark red solution was warmed to about 40 °C while heavy precipitation occurred and the color changed to light brown. After 1 h the precipitate was removed by filtration and washed with 200 mL ethyl acetate. The organic layer was washed three times with saturated NAHC03, once with brine and dried with NA2S04. The solution was evaporated to dryness and the resulting oil was purified on a silicagel pad eluting with DCM-hexane gradient (30percent to 60percent DCM) to yield after evaporation yellow Compound 4. [0217] H'-NMR (CDC13) : S (ppm) 10.39 (s, 1H, CHO), 8.57 (d, 1H, J=2.1 Hz, AR-H2) 8.40-8. 36 (dd, 1H, J=2.1 Hz and 8.4Hz, Ar-H6), 8.14 (d, 1H, J=8. 4Hz, AR-H5), 4.00 (s, 3H, OCH3). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
64% | In N,N-dimethyl-formamide; for 48h;Heating / reflux; | Intermediate 31; Methyl 3-r(E)-2-(dimethylamino)ethenyll-4-nitrobenzoate; To a solution of methyl 3-methyl-4-nitrobenzoate (25 g, 128 mmol) in DMF (100 ml) was added lambda/,lambda/-dimethyl-1 ,1-bis(methyloxy)methanamine (75 ml, in excess). The reaction mixture was stirred at reflux for 48 hours and concentrated. The red dark solid was diluted with toluene (150 ml), heptane (1.5 I) was added and the product was precipitated. This precipitate was filtered and washed with heptane to give the title compound as purple solid (20.5 g, 64%). <n="44"/>NMR1H NMR (300 MHz), CDCI3 delta: 8.14 (dd, 1 H, J=1.80 Hz), 7.83 (d, 1 H, J=8.56 Hz), 7.08 (d, 1 H, J=13.50 Hz), 5.78 (d, 1 H, J=13.33Hz), 3.95 (s, 3H), 2.95 (s, 6H). |