CN102716768B - 一种2-芳基丙酸锌催化剂及其制备方法和应用 - Google Patents
一种2-芳基丙酸锌催化剂及其制备方法和应用 Download PDFInfo
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Abstract
本发明属于化工催化剂技术领域,具体涉及一种2-芳基丙酸锌催化剂及其制备方法和应用。本发明2-芳基丙酸锌催化剂的结构式为下述之一种。该催化剂可用于均相催化相应的α-卤代芳基缩酮的1,2-芳基重排反应中,尤其可合成产率高和环境友好的2-芳基丙酸类非甾体抗炎镇痛药物,例如:布洛芬、酮基布洛芬、洛索洛芬、氟比洛芬、非诺洛芬或萘普生等。
Description
技术领域
本发明属于化工催化剂技术领域,具体涉及一种2-芳基丙酸锌催化剂及其制备方法和应用,尤其在合成2-芳基丙酸类非甾体抗炎镇痛药物中的应用。
背景技术
2-芳基丙酸类非甾体抗炎镇痛药物如布洛芬、酮基布洛芬、洛索洛芬、氟比洛芬、非诺洛芬、萘普生等,在临床上广泛用于治疗骨关节炎、类风湿性关节炎,以及多种发热和疼痛症状的缓解。
在催化剂存在下,α-卤代芳基缩酮的1, 2-芳基重排是制备2-芳基丙酸类非甾体抗炎镇痛药物的经典方法。Giordano用AgBF4催化α-卤代芳基缩酮的1, 2-芳基重排反应,但AgBF4价格昂贵,不适合工业化生产(J. Chem. Soc. Perkin Trans. 1, 1982, 11,2575;Tetrahedron, 1982, 23, 1385)。有文献报道路易斯酸如无水ZnCl2、ZnBr2或SnCl4等可催化α-卤代芳基缩酮的1, 2-芳基重排,但反应过程中有胶状黑色不溶物产生,分离操作较繁琐 (欧洲专利EP0035305、0034871、0163338;美国专利4414405;J. Org. Chem. 1983, 48, 4658;医药工业,1988,19, 483)。陈芬儿等(中国专利ZL00127293.4;中国医药工业杂志,1998, 29,531;华西药学杂志,1995, 10,129)、Piccolo(J. Org. Chem., 1987, 52, 10)及欧洲专利0174844描述用ZnO、ZnS或Zn(OH)2催化这一重排反应,重排收率较高,但由于非均相催化剂存在,该反应需要较高温度,容易冲料,且产品质量较差。美国专利US4623736披露2-乙基己酸锌催化α-氯代对异丁苯基缩酮重排制备布洛芬,但这一反应条件苛刻,在几乎无溶剂存在下反应,产物是黑色油状物,质量较差。中国专利ZL92106667.8采用对甲苯磺酸锌或其与ZnO的混合物催化分子重排制备布洛芬,需140-150℃高温进行。
发明内容
本发明目的在于克服现有技术不足,提供一种2-芳基丙酸锌均相催化剂及其制备方法和应用,尤其该催化剂在合成2-芳基丙酸类非甾体抗炎镇痛药物中的应用。
本发明提供的这类2-芳基丙酸锌催化剂,具有如下结构式之一种:
其中,R1,R2分别选自氢,C1-C4烷基,甲氧基,三氟甲基,卤素,苯基,苄基;R1为邻、间、对位取代,单取代或多取代;R2为C-5, 6, 7, 8位取代,单取代或多取代。
本发明所述的这类2-芳基丙酸锌催化剂的合成路线如下:
具体步骤为:
(1) 在室温下,将碱土氢氧化物溶于C1-C4醇中,加入2-芳基丙酸,室温至100℃反应0.5-2 h,得2-芳基丙酸碱土盐溶液。所述的碱土氢氧化物为氢氧化锂、氢氧化钠、氢氧化钾或氢氧化钙,2-芳基丙酸与碱土氢氧化物的摩尔比为1:0.8—1:1.5。
(2) 在上述2-芳基丙酸碱土盐溶液中,加入锌盐或氧化锌,室温至100℃反应0.5-20 h,得2-芳基丙酸锌;所述锌盐为氯化锌、硫酸锌或醋酸锌;所述的锌盐或氧化锌,与2-芳基丙酸碱土盐的摩尔比为0.5:1- 0.5:1.2。
本发明较佳反应条件为:步骤(1)中,碱土氢氧化物为氢氧化钠,C1-C4醇为甲醇或乙醇,反应温度为45--55℃,反应时间为0.5-2 h,2-芳基丙酸、碱土氢氧化物的摩尔比为1:1—1:1.1。步骤(2) 中,所用的锌盐为醋酸锌,反应温度为50--80℃,反应时间为6-10 h,醋酸锌与2-芳基丙酸钠的摩尔比为0.5:1--0.5:1.1 。
本发明所述的2-芳基丙酸锌催化剂可用于催化相应的α-卤代芳基缩酮(III)的1, 2-芳基重排反应。尤其是通过所述重排反应,催化合成2-芳基丙酸类非甾体抗炎镇痛药物。具体说来,2-芳基丙酸锌与α-卤代芳基缩酮在单一的或混合的芳香烃类溶剂中,80-160 ℃反应1-10 h。所述的芳香烃类溶剂为苯、单取代苯或多取代苯等。2-芳基丙酸锌催化剂与α-卤代芳基缩酮的摩尔比为0.01:1-0.5:1。
本发明中,重排反应较佳反应条件为:芳香烃类溶剂为甲苯,反应温度为110--120 ℃,催化剂、α-卤代芳基缩酮的摩尔比为0.02:1-0.1:1。α-卤代芳基缩酮可参考如下文献方法制备:US4623736;J. Chem. Soc. Perkin Trans. 1, 1986, 1983;陈芬儿等,中国医药工业杂志,1996, 27,195;中国医药工业杂志,1998,29,531;华西药学杂志,1995,10,129;熊贤强等,中国医药工业杂志,2000, 31,436。α-卤代芳基缩酮可选自下述结构式之一种:
本发明所述的2-芳基丙酸锌催化剂合成简单,并可高产率、条件温和地均相催化合成2-芳基丙酸类非甾体抗炎镇痛药物。
具体实施方式
下面结合具体实施例对本发明进行进一步描述,但本发明的保护范围并不限于此。
实施例1、2-苯基丙酸锌的合成
于100 mL圆底烧瓶中,加入氢氧化钠0.4 g (0.01 mol),甲醇15 mL,室温搅拌溶解后,加入2-苯基丙酸1.5 g (0.01 mol),50 ℃反应0.5 h,冷却至室温。滴加二水醋酸锌1.1 g (0.005 mol)溶于甲醇(10 mL)的溶液,滴毕,50 ℃反应1 h,回收大部分溶剂,过滤出白色固体,甲醇溶液洗,于减压下150 ℃干燥7 h, 得2-苯丙酸锌1.81 g,收率99.5%,m.p.262-264 ℃。
实施例2、2-对甲苯基丙酸锌的合成
于100 mL圆底烧瓶中,加入氢氧化钠0.44 g (0.011 mol),甲醇15 mL,室温搅拌溶解后,加入2-对甲苯基丙酸1.64 g (0.01 mol),50 ℃反应2 h,冷却至室温。滴加二水醋酸锌1.1 g (0.005 mol)溶于甲醇(10 mL)的溶液,滴毕,回流反应7 h,回收大部分溶剂,过滤出白色固体,甲醇溶液洗,于减压下150 ℃干燥7 h,得2-对甲苯基丙酸锌1.66 g,收率84.7%,m.p.256-258 ℃。
实施例3、2-对异丁苯基丙酸锌的合成
于25 mL圆底烧瓶中,加入氢氧化钠44 mg (1.1 mmol),甲醇8 mL,室温搅拌溶解后,加入2-对异丁苯基丙酸206 mg (1 mmol),50 ℃反应2 h,冷却至室温。滴加二水醋酸锌110 mg (0.5 mmol)溶于甲醇(2 mL)的溶液,滴毕,回流反应10 h,回收大部分溶剂,过滤出白色固体,甲醇溶液洗,于减压下150 ℃干燥7 h,得2-对异丁苯基丙酸锌192 mg,收率80.8%,m.p.203-206 ℃。
实施例4、2-(6-甲氧萘基)丙酸锌的合成
于25 mL圆底烧瓶中,加入氢氧化钠40 mg (1 mmol),甲醇8 mL,室温搅拌溶解后,加入2-(6-甲氧萘基-2-基)丙酸230 mg (1 mmol),50 ℃反应2 h,冷却至室温。滴加二水醋酸锌110 mg (0.5 mmol)溶于甲醇(2 mL)的溶液,滴毕,回流反应7 h,回收大部分溶剂,过滤出白色固体,甲醇溶液洗,于减压下150 ℃干燥7 h,得2-(6-甲氧萘基-2-基)丙酸锌183 mg,收率69.8%,m.p.205-207 ℃。
下面是2-芳基丙酸锌在催化相应的α-卤代芳基缩酮的1, 2-芳基重排反应中的应用的例子。
实施例5、2-(6-甲氧基-2-基)萘基丙酸锌催化合成2-(6-甲氧基-2-基)萘基丙酸((±)-萘普生)
于500 mL圆底烧瓶中,加入2-(1-溴乙基)-2-(6-甲氧萘-2-基)-5,5-二甲基-1,3-环氧己烷16.7 g (0.05 mol)、2-(6-甲氧基-2-基)萘基丙酸锌0.523 g(0.001 mol)、甲苯50 mL, 回流反应5.5 h,加入30%氢氧化钠溶液(50 mL),搅拌回流3.5 h后,冷却至50℃,加入水(30 mL)和少量活性碳,继续搅拌回流0.5 h。冷却,过滤、静置,分出水层,甲苯层用水洗(50 mL×3),合并水层,用浓盐酸调pH至1-2,析出白色固体,过滤,水洗,干燥的粗品。用乙醇-水重结晶,得白色粉末11.14 g,收率96.9%。mp 152-154 ℃。
实施例6、2-(4-甲基苯基)丙酸锌催化合成2-(4-甲氧基苯基)丙酸(洛索洛芬关键中间体)
于500 mL圆底烧瓶中,加入2-(1-氯乙基)-5,5-二甲基-2-对甲苯基-1,3-环氧己烷13.4 g (0.05 mol)、2-(6-甲氧萘基)丙酸锌0.523 g (0.001 mol)、甲苯50 mL, 回流反应3.5 h,加入30%氢氧化钠溶液(50 mL),搅拌回流3.5 h后,冷却至50 ℃,加入水(30 mL)和少量活性碳,继续搅拌回流0.5 h。冷却,过滤、静置,分出水层,甲苯层用水洗(50 mL×3),合并水层,用浓盐酸调pH至1-2,氯仿提取(30 mL×3),无水硫酸钠干燥,蒸去氯仿,得无色固体7.92 g,收率96.6%。mp 37-38 ℃。
实施例7、2-(4-异丁基苯基)丙酸锌催化合成2-(4-异丁基苯基)丙酸(布洛芬)
于500 mL圆底烧瓶中,加入2-(1-溴乙基) -2-对异丁苯基-1,3-环氧戊烷15.6 g (0.05 mol)、2-(6-甲氧萘基)丙酸锌0.784 g(0.0015 mol)、甲苯50 mL, 回流反应3.0 h,加入30%氢氧化钠溶液(50 mL),搅拌回流3.5 h后,冷却至50 ℃,加入水(30 mL)和少量活性碳,继续搅拌回流0.5 h。冷却,过滤、静置,分出水层,甲苯层用水洗(50 mL×3),合并水层,用浓盐酸调pH至1-2,析出白色固体,过滤,水洗,干燥的粗品。用乙醇-水重结晶,得白色粉末10.01 g,收率97.2%。mp 74-75 ℃。
实施例8、2-(3-苯氧基)丙酸锌催化合成2-(3-苯氧基)丙酸(非诺洛芬)
于500 mL圆底烧瓶中,加入1-(1,1-二乙氧基-2-碘丙基)-3-苯氧苯8.52 g (0.02 mol)、2-(6-甲氧萘基)丙酸锌0.219 g(0.0004 mol)、甲苯30 mL, 回流反应3.5 h,加入30%氢氧化钠溶液(50 mL),搅拌回流3.5 h后,冷却至50 ℃,加入水(15 mL)和少量活性碳,继续搅拌回流0.5 h。冷却,过滤、静置,分出水层,甲苯层用水洗(30 mL×3),合并水层,用浓盐酸调pH至1-2,氯仿提取(30 mL×3),无水硫酸钠干燥,蒸去氯仿,得浅黄色液体4.48 g,收率92.5%。1H NMR(CDCl3)δ 1.49 (d, 3 H, CH3)、3.71 (q, 1 H, CH)、6.87-7.37 (m, 9 H, ArH)、7.50-8.40 (brs, COOH)。
实施例9、2-(3-氟-4-苯基)苯丙酸锌催化合成2-(3-氟-4-苯基)苯丙酸(氟比洛芬)
于500 mL圆底烧瓶中,加入2-(1-溴乙基)-2-(2-氟-(1,1’-联二苯-4-基)-5,5-二甲基-1,3-二氧环己烷7.84 g (0.02 mol)、2-(6-甲氧萘基)丙酸锌0.276 g(0.0005 mol)、甲苯30 mL, 回流反应3.5 h,加入30%氢氧化钠溶液(50 mL),搅拌回流3.5 h后,冷却至50 ℃,加入水(15 mL)和少量活性碳,继续搅拌回流0.5 h。冷却,过滤、静置,分出水层,甲苯层用水洗(30 mL×3),合并水层,用浓盐酸调pH至1-2,析出白色固体,过滤,水洗,干燥的粗品。用乙醇-水重结晶,得白色粉末4.45 g,收率91.2%。mp 110-112 ℃。
Claims (1)
1. 一种2-芳基丙酸锌催化剂在均相催化α-卤代芳基缩酮的1, 2-芳基重排反应中的应用,其中所述2-芳基丙酸锌催化剂是2-(6-甲氧基-2-基)萘基丙酸锌;所述α-卤代芳基缩酮为2-(1-溴乙基)-2-(6-甲氧萘-2-基)-5,5-二甲基-1,3-环氧己烷,
其特征在于,于500 mL圆底烧瓶中,加入2-(1-溴乙基)-2-(6-甲氧萘-2-基)-5,5-二甲基-1,3-环氧己烷16.7 g、2-(6-甲氧基-2-基)萘基丙酸锌0.523 g、甲苯50 mL, 回流反应5.5 h,加入30%氢氧化钠溶液50 mL,搅拌回流3.5 h后,冷却至50℃,加入水30 mL和少量活性碳,继续搅拌回流0.5 h;冷却,过滤、静置,分出水层,甲苯层用50 mL水洗3次,合并水层,用浓盐酸调pH至1-2,析出白色固体,过滤,水洗,干燥得粗品;用乙醇-水重结晶,得白色粉末11.14 g,收率96.9%。
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