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Type
HazMat fee for 500 gram (Estimated)
Excepted Quantity
USD 0.00
Limited Quantity
USD 15-60
Inaccessible (Haz class 6.1), Domestic
USD 80+
Inaccessible (Haz class 6.1), International
USD 150+
Accessible (Haz class 3, 4, 5 or 8), Domestic
USD 100+
Accessible (Haz class 3, 4, 5 or 8), International
USD 200+
Structure of 935-28-4 * Storage: {[proInfo.prStorage]}
* 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.
Stage #1: With hydrazine In diethylene glycol at 170℃; for 0.5 h; Stage #2: With potassium hydroxide In diethylene glycol at 20 - 200℃; for 2 h;
2, 6-Diacetylpyridine (2g) was dissolved in diethyleneglycol(50mut) with hydrazine monohydrate (3.6ml). The reaction mixture was heated at170 C for 30 min. The reaction mixture was then cooled to room temperature for the addition of potassium hydroxide (3.1g), then heated at200 C for 2h when the reaction mixtue lost all colour. The reaction mixture was then cooled to room temperature and poured onto water. The mixture was extracted with ether, organics combined, washed with brine, dried(MgS04) and concentrated to give desired product (1.5g, 93percent), AH(CDCI3) 1.29 (6H, t, J7. 6Hz), 2.76- 2.82 (4H, q, J 7.6Hz), 6.96 (2H, d, J 7.6Hz), 7.50 (1 H, t, J 7.6Hz).
58%
With sodium hydroxide; hydrazine In diethylene glycol at 120℃; for 16 h;
A mixture of NaOH (14.7 g, 0.37 mol), hydrazine monohydrate (15 ml) and 2,6-diacetylpyridine (6g, 36.8 mmol) suspended in diethylene glycol (27 ml_) was cautiously heated to 120 °C for 16 hours. The mixture was cooled to room temperature and partitioned between H2O and ether. The ether extracts were washed with 1 N NaOH, dried over MgSO4 and concentrated to a clear oil. Flash column chromatography (0percent to 15percent EtOAc in hexanes) gave the product as a clear oil (2.9 g, 58percent). 1H NMR (400 MHz, CDCI3): 5 1.29 (t, J=7.8 Hz, 3 H), 2.80 (d, J=7.8 Hz, 2 H), 6.97 (d, J=2.0 Hz, 2 H), 7.51 (t, J=7.6 Hz, 1 H). 2,6-Diethyl-pyridine has also been prepared as follows:A solution of ethylmagnesium bromide in ethyl ether [prepared from Mg (16.5 g, 0.68 mol) and ethyl bromide (50 mL, 0.68 mol) in 500 ml_ of ether] was added dropwise to a mixture of 2,6-dichloropyridine (50 g, 0.34 mol) and NiCI2(dppp) (1.0 g, 2 mol) in anhydrous ethyl ether(500 mL).at 0 °C unde(r N3 atmosphere. After addition, the resulting mixture was stirred,. , ' >.,"?, '['A V ' "' > 'ambient temperature oveifngh'tj was then heated to reflux for about 3 hours. The suspensiatonwas poured into cushed ice (200 g) and the mixture was saturated with NH4CI. The organic layer was separated and the aqueous phase was extracted with ether (200 mL x 3). The combined organic layers were washed with water, brine, dried over Na2SO4 and concentrated to give the product (41 .1 g, 89percent).
Reference：
[1] Patent: WO2005/49023, 2005, A1, . Location in patent: Page/Page column 58
[2] Egyptian Journal of Chemistry, 2000, vol. 43, # 4, p. 297 - 308
[3] Patent: WO2006/18725, 2006, A1, . Location in patent: Page/Page column 119
[4] Collection of Czechoslovak Chemical Communications, 1959, vol. 24, p. 36,43
[5] Archiv der Pharmazie, 1980, vol. 313, # 4, p. 307 - 310
[6] Egyptian Journal of Chemistry, 2000, vol. 43, # 4, p. 297 - 308
2
[ 2402-78-0 ]
[ 925-90-6 ]
[ 935-28-4 ]
Yield
Reaction Conditions
Operation in experiment
89%
at 0 - 20℃; Heating / reflux
A mixture of NaOH (14.7 g, 0.37 mol), hydrazine monohydrate (15 ml) and 2,6-diacetylpyridine (6g, 36.8 mmol) suspended in diethylene glycol (27 ml_) was cautiously heated to 120 °C for 16 hours. The mixture was cooled to room temperature and partitioned between H2O and ether. The ether extracts were washed with 1 N NaOH, dried over MgSO4 and concentrated to a clear oil. Flash column chromatography (0percent to 15percent EtOAc in hexanes) gave the product as a clear oil (2.9 g, 58percent). 1H NMR (400 MHz, CDCI3): 5 1.29 (t, J=7.8 Hz, 3 H), 2.80 (d, J=7.8 Hz, 2 H), 6.97 (d, J=2.0 Hz, 2 H), 7.51 (t, J=7.6 Hz, 1 H). 2,6-Diethyl-pyridine has also been prepared as follows:A solution of ethylmagnesium bromide in ethyl ether [prepared from Mg (16.5 g, 0.68 mol) and ethyl bromide (50 mL, 0.68 mol) in 500 ml_ of ether] was added dropwise to a mixture of 2,6-dichloropyridine (50 g, 0.34 mol) and NiCI2(dppp) (1.0 g, 2 mol) in anhydrous ethyl ether(500 mL).at 0 °C unde(r N3 atmosphere. After addition, the resulting mixture was stirred,. , ' >.,"?, '['A V ' "' > 'ambient temperature oveifngh'tj was then heated to reflux for about 3 hours. The suspensiatonwas poured into cushed ice (200 g) and the mixture was saturated with NH4CI. The organic layer was separated and the aqueous phase was extracted with ether (200 mL x 3). The combined organic layers were washed with water, brine, dried over Na2SO4 and concentrated to give the product (41 .1 g, 89percent).
Reference：
[1] Synlett, 2010, # 5, p. 796 - 800
[2] Patent: WO2006/18725, 2006, A1, . Location in patent: Page/Page column 119
[3] Journal of the American Chemical Society, 2017, vol. 139, # 37, p. 13126 - 13140
[4] Journal of Organic Chemistry, 1994, vol. 59, # 18, p. 5125 - 5127
[5] Chemistry - A European Journal, 2017, vol. 23, # 7, p. 1521 - 1525
3
[ 108-48-5 ]
[ 74-88-4 ]
[ 1122-69-6 ]
[ 935-28-4 ]
Reference：
[1] Journal of the American Chemical Society, 1957, vol. 79, p. 1667
[2] Patent: US9200135, 2015, B2,
Chemistry
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