3-アセチルピリジン 化学特性,用途語,生産方法
外観
無色～黄褐色, 澄明の液体
溶解性
エタノール, エーテル, 酸に可溶。水に極めて溶けやすく、エタノールに溶ける。
天然物の起源
Reported found in roasted filberts, beer, brandy, coffee, malt and wheaten bread.
使用
3-Acetylpyridine used as an intermediate for the synthesis of risedronate sodium, inhibitor of bone resorption. It is also used in perfumery.
調製方法
Produced from Ethyl nicotinate and Ethyl
acetoacetate, in principle by hydrolysis of
Aceto acetylpyridine.
定義
It is a nicotinic acidantagonist.
製造方法
Dry distillation of calcium nicotinate with calcium acetate.
安全性プロファイル
Poison by ingestion. Moderately toxic by intraperitoneal routeMutation data reported. A flammable liquid. When heated to decomposition emits toxic fumes of NOx,. See also KETONES
合成
A mixture of 22 g/h of methyl nicotinate, 57 g/h of acetic acid and 20 g/h of water was evaporated in an evaporator and passed, together with 10 l/h of nitrogen, at 400° C., over 100 ml of catalyst, which contained 2% by weight of sodium oxide, the remainder being anatase. The catalyst was prepared by impregnating 980 g of TiO2 carrier I with a solution which contained 20 g of Na2O (as aqueous NaOH). The reaction gases were then cooled and were collected in a receiver. From the discharged two-phase mixture, the organic phase was analyzed by gas chromatography. The selectivity with respect to 3-acetylpyridine was 60%.
純化方法
It is purified by dissolving in HCl, extracting with Et2O to remove the possible impurity of nicotinic acid, basified with NaOH and extracted with Et2O. The dried extract is filtered, evaporated and the residual oil is distilled. If the NMR spectrum indicates further impurities, then convert it to the phenylhydrazone (m 137o, yellow needles from EtOH). This is hydrolysed with HCl [Engler & Kiby Chem Ber 22 597 1889], the phenylhydrazine HCl is removed by filtration, NaNO2 is added, the solution is basified with aqueous NaOH and extracted with Et2O as before and distilled at atmospheric pressure to give 3-acetylpyridine as a colourless oil. Purification can also be achieved by shaking with 50% aqueous KOH, extracting with Et2O, drying the extract and distilling it at atmospheric pressure or in vacuo. [Kloetzel & Chubb J Am Chem Soc 79 4226 1957.] The hydrochloride has m 180-181o (from MeOH/EtOH), the picrate has m 133.8-134.8o (from H2O), and the phenylhydrazone has m 137o (129-130o)(needles, from EtOH) [Webb & Webb J Am Chem Soc 71 2285 1949]. The ketoxime has m 112o (from EtOH or *C6H6). [Strong & McElvain J Am Chem Soc 55 816 1933, Kolloff & Hunter J Am Chem Soc 63 490 1941, Beilstein 21/7 V 394.]
3-アセチルピリジン 上流と下流の製品情報
原材料
準備製品