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CAS No. : | 2587-00-0 | MDL No. : | MFCD00130246 |
Formula : | C5H3Cl2NO | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | RFOMGVDPYLWLOC-UHFFFAOYSA-N |
M.W : | 163.99 | Pubchem ID : | 817673 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | 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 hydroxide; In dimethyl sulfoxide; | Example 3 Preparation of 1-Hydroxy-6-(3,5,5-trimethylhexyloxy) -pyridine-2 (1H) -one The 0.82 g (0.0050 moles) of 2,6-dichloropyridine N-oxide and 0.80 g (90percent) (0.0050 moles) of <strong>[3452-97-9]3,5,5-trimethyl-1-hexanol</strong> was reacted with 0.206 g (0.0050 moles) of ground sodium hydroxide in 8.2 ml of DMSO at 80° C. for 8.5 hours to give 2-chloro-6-(3,5,5trimethylhexyloxy)pyridine N-oxide. It was reacted with 0.600 g (0.015 moles) of ground sodium hydroxide at 80° C. for 4 hours to give 1-hydroxy-6-(3,5,5-trimethyl-hexyloxy) pyridine-2(1H)-one. After cooling, it was added 74 ml of water and was adjusted with 6N HCL to pH 3. The precipitate was filtered and washed with water to give 0.577 g (45percent). It was recrystallized from ethyl acetate and hexanes: mp 130.5°-131° C. |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
48% | With pyridine; at 20℃; for 2h; | A mixture of 44 (300 mg, 1.56 mmol), 2,6-dichloropyridine N-oxide (256 mg, 1.56 mmol) in pyridine (6 mL) was stirred for 2 h at rt. Then, 2 N HCl (50 mL) was added to the reaction, followed by filtration, and removal of the solvent in vacuo. The residue was purified by column chromatography (eluent: CH2Cl2/EtOAc 99:1) to afford the desired compound (9) as white crystals in 48% yield. Mp 236-237 C. 1H NMR delta 2.50 (3H, s, 4-CH3), 6.41 (1H, s, 3-H), 6.55 (1H, dd, J1 = 8.1 Hz, J2 = 1.8 Hz, 6-H), 7.01 (1H, t, J = 8.4 Hz, H of pyridine), 7.28, 7.54 (each 1H, dd, J1 = 8.4 Hz, J2 = 1.8 Hz, 2H of pyridine), 7.62 (1H, d, J = 1.8 Hz, 8-H), 7.73 (1H, d, J = 8.1 Hz, 5-H). 13C NMR delta 18.83, 58.42, 116.76, 120.27, 122.30, 124.00, 125.77, 126.45, 131.11, 133.28, 141.80, 151.75, 154.05, 154.91, 159.97. ESI MS m/z 320 (M+ + 1). |
48% | With pyridine; for 2h;Reflux; | 7-mercapto-4-methyl-chromen-2-one (5,300 mg, 1 . 56mmol) and 2,6-dichloro-pyridine N-oxide (256 mg, 1 . 56mmol) in pyridine (6 ml) in the solvent reflux 2 hours; then adding 2 equivalents of hydrochloric acid (50 ml), reducing pressure and evaporating the solvent after filtering, the chromatographic column for separation (elution agent is chloroform/ethyl acetate = 99/1) to obtain 240 mg product 13,yield 48%, melting point is 236-237C. 1 HNMR (CDCl 3): delta 2.50 (3H, s, 4-CH 3), 6.41 (1H, s, 3-H), 6.55 (1H, dd, J1 = 8.1Hz, J2 = 1.8Hz, 6-H), 7.01 (1H, t, J = 8.4Hz, H of pyridine), 7.28,7 . 54 (each1H, dd, J1 = 8.4Hz, J2 = 1.8Hz, 2H of pyridine), 7.62 (1H, d, J = 1.8Hz, 8-H), 7.73 (1H, d, J = 8.1Hz, 5-H). 13 CNMRdelta 18.83,58 . 42,116.76,120.27,122 . 30,124.00,125.77,126 . 45,131.11,133.28,141 . 80,151.75,154.05,154 . 91,159.97. ESIMS m/z320 (M ++ 1). |
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