CN105461703B - 一种brexpiprazole的制备方法 - Google Patents
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Abstract
本发明公开了一种式(1)所示的化合物brexpiprazole的制备方法,尤其是以4‑胺基苯并[b]噻吩为起始原料合成哌嗪环,避开重金属钯催化反应,减少合成步骤和杂质,降低成本的制备方法。
Description
技术领域
本发明涉及式(1)所示的化合物brexpiprazole的制备方法,尤其是以4-胺基苯并[b]噻吩为起始原料合成哌嗪环,避开重金属钯催化反应,减少合成步骤,降低成本的制备方法,属于原料药合成技术领域。
技术背景
Brexpiprazole是大冢制药公司研发的首个多巴胺、部分5-HT1A受体激动剂以及5-HT2A受体拮抗剂化合物,用于精神分裂症以及重度抑郁症的辅助治疗,被认为是继该公司研发的畅销药物——阿立哌唑之后的又一重磅品种。
Brexpiprazole在多个单胺系统具有广泛的活性,对多巴胺D2受体的部分激动剂活性下降,且对特定5-HT受体(如5-HT1A、5-HT2A、5-HT7)的亲和力提高,具有更好的疗效和耐受性,可减少患者静坐不能、不安和失眠等不良反应。因此,brexpiprazole是一种很有临床意义的多靶点抗精神疾病药物,具有良好的开发前景。
目前,大冢制药公司的专利报道(WO2006112464A1,CN101155804B)的brexpiprazole的制备方法主要是由以下路线实现的:
该路线以4-溴苯并[b]噻吩(6)为起始物料,通过钯催化与哌嗪偶联合成化合物7,然后在甲醇中与浓盐酸成盐生成化合物3,其他步骤与本发明所述方法相同。该路线使用了重金属钯催化反应,成本昂贵,后处理复杂,且容易产生以下两种杂质(专利WO2013015456):及 影响brexpiprazole的质量。
目前急需对brexpiprazole的制备进行改进,探讨一种工艺简捷,更加安全,质量好、收率高,低成本的合成方法,这将对brexpiprazole及其中间体的进一步开发具有重要意义。
发明内容
本发明的目的是寻找一种反应条件简单,质量稳定、收率较高的brexpiprazole的制备方法。其优点在于采用4-胺基苯并[b]噻吩为起始原料,通过烷基化合成哌嗪环,使中间体一步从体系中合成并分离出来,原料易得,后处理简单,减少反应步骤,收率高,质量好,成本低。
为达到上述目的,本发明的技术方案为:
一种brexpiprazole的制备方法,其特征在于以4-胺基苯并[b]噻吩为起始原料,经过三步反应制得brexpiprazole,合成路线为:
反应步骤为:
a.3的制备
将4-胺基苯并[b]噻吩(式2)与二(2-氯乙基)胺盐酸盐相混合,加入一定量的对甲苯磺酰胺(PTSA)和有机溶剂,于120~150℃下搅拌反应约16小时,TLC检测至原料2基本反应完全,然后自然降至室温,再降至0~5℃保温1~2小时,抽滤得化合物3。
b.1的制备
将3和碱混合,然后加入溶剂,升温至40~60℃搅拌30min,固体溶解后加入4,然后升温至60~90℃,搅拌反应约8~18小时,TLC检测至原料5基本反应完全,然后自然降至室温,再降至0~5℃保温1~2小时,抽滤得化合物1。
c.4的制备
将7-羟基-2(1H)-喹啉铜(式5)加入到有机溶剂中,然后加入碱,升温至50~70℃搅拌30min,固体溶解后加入1-溴4-氯丁烷,然后升温至60~90℃,搅拌反应约8~18小时,TLC检测至原料5基本反应完全,然后自然降至室温,再降至0~5℃保温1~2小时,抽滤得化合物4。
具体实施方式
下面结合实施例对本发明做进一步地详细说明,但是本发明要求保护的范围并不局限于实施例表示的范围。
实施例1
1-苯并[b]噻吩-4-基-哌嗪盐酸盐化合物的3制备
将4-胺基苯并[b]噻吩14.92g(100mmol)与二(2-氯乙基)胺盐酸盐17.85g(100mmol)加入到反应瓶中,再加入对甲苯磺酰胺0.86g(5mmol)和二甲苯225mL,于120~150℃下搅拌反应16小时。然后自然降至室温,再降至0℃保温2小时,抽滤得类白色固体结晶21.66g,收率85.0%,纯度98%。
1H-NMR(DMSO-d6)δppm:3.24-3.35(8H,m),6.94(1H,d,J=7.6Hz),7.31(1H,dd,J=7.8Hz,7.8Hz),7.50(1H,d,J=5.5Hz),7.68(1H,d,J=8.1Hz),7.73(1H,d,J=5.5Hz),9.36(2H,brs).
实施例2
7-[4-(4-苯并[b]噻吩-4基-哌嗪-1-基)丁氧基]-1H-喹啉-2-酮化合物1的制备
将1-苯并[b]噻吩-4-基-哌嗪盐酸盐14.01g(55mmol)、碳酸钠15.90g(150mmol)、水140mL和甲醇70mL加入到反应瓶中,升温至50℃搅拌30min,固体溶解后加入7-(4-氯丁氧基)-1H-喹啉-2-酮12.58g(50mmol),然后升温至70℃,搅拌反应约16小时,然后自然降至室温,再降至0℃保温2小时,抽滤得类白色固体结晶20.70g,收率95.5%,纯度98%。
1H-NMR(DMSO-d6)δppm:1.6-1.75(2H,m),1.75-1.9(2H,m),2.45(2H,t,J=7Hz),2.5-2.8(4H,m),2.9-3.2(4H,m),4.06(2H,t,J=6.5Hz),6.31(1H,d,J=9.5Hz),6.75-6.85(2H,m),6.89(1H,d,J=7.5Hz),7.28(1H,dd,J=8Hz,8Hz),7.40(1H,d,J=5.5Hz),7.55(1H,d,J=9.SHz),7.62(1H,d,J=8Hz),7.70(1H,d,J=5.5Hz),7.81(1H,d,J=9.5Hz),11.59(1H,bs).
实施例3
7-(4-氯丁氧基)-1H-喹啉-2-酮化合物的4制备
将7-羟基-2(1H)-喹啉铜16.12g(100mmol)加入到反应瓶中,然后加入甲醇160mL,再加入氢氧化钾7.01g(125mmol),升温至50℃搅拌30min,固体溶解后加入1-溴4-氯丁烷51.44g(300mmol),然后升温至回流,搅拌反应16小时,然后自然降至室温,再降至0~5℃保温2小时,抽滤得类白色固体结晶20.44g,收率81.2%,纯度95%。
1H-NMR(DMSO-d6)δppm:1.95-2.15(4H,m),3.60-3.70(2H,m),4.10(2H,t,J=5.6Hz),6.56(1H,dd,J=9.0Hz,3.8Hz),6.82(1H,dd,J=8.7Hz,2.4Hz),6.86(1H,d,J=2.3Hz),7.45(1H,d,J=8.7Hz),7.75(1H,d,J=9.4Hz),12.55(1H,brs)。
Claims (5)
1.式1化合物的制备方法,该方法包括下述步骤:
a.将4-氨基苯并[b]噻吩(式2)与二(2-氯乙基)胺盐酸盐相混合,加入一定量的对甲苯磺酰胺和有机溶剂,于120~150℃下搅拌反应16小时,TLC检测至原料2基本反应完全,然后自然降至室温,再降至0~5℃保温1~2小时,抽滤得化合物3;
b.将3和碱混合,然后加入溶剂,升温至40~60℃搅拌30min,固体溶解后加入4,然后升温至60~90℃,搅拌反应约8~18小时,TLC检测至原料基本反应完全,然后自然降至室温,再降至0~5℃保温1~2小时,抽滤得化合物1;
2.根据权利要求1所述的式(1)化合物的制备方法,其特征在于步骤a中所述的对甲苯磺酰胺的mol百分比含量为5~10%。
3.根据权利要求1所述的式(1)化合物的制备方法,其特征在于步骤a中所述的有机溶剂为二甲苯、乙二醇单乙醚、二甲基乙酰胺及二甲基甲酰胺中的一种。
4.根据权利要求1所述的式(1)化合物的制备方法,其特征在于步骤b中所述的碱为氢氧化钠、氢氧化钾、碳酸钠、碳酸铯及三乙胺中的一种。
5.根据权利要求1所述的式(1)化合物的制备方法,其特征在于步骤b中所述的溶剂为水,或水与甲醇、异丙醇、乙腈及丙酮中的一种的组合,其体积比为2∶1。
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| US20170320862A1 (en) | 2016-05-03 | 2017-11-09 | Cadila Healthcare Limited | Process for the preparation of brexpiprazole and intermediates thereof |
| CN107365305A (zh) * | 2016-05-12 | 2017-11-21 | 上海奥博生物医药技术有限公司 | 一种依匹哌唑新晶型及其制备方法 |
| PL233778B1 (pl) | 2016-07-19 | 2019-11-29 | Adamed Spolka Z Ograniczona Odpowiedzialnoscia | Sposob wytwarzania brekspiprazolu oraz zastosowanie zwiazkow posrednich w sposobie wytwarzania brekspiprazolu |
| CN106632291A (zh) * | 2016-10-09 | 2017-05-10 | 瑞阳制药有限公司 | 依匹唑哌的晶型及其制备方法和用途与药用组合物 |
| CN107936005A (zh) * | 2016-10-13 | 2018-04-20 | 上海科胜药物研发有限公司 | 一种依匹哌唑新晶型ii及其制备方法 |
| CN106831739A (zh) * | 2016-12-05 | 2017-06-13 | 浙江燎原药业股份有限公司 | 一种用于合成依匹哌唑的制备方法 |
| CN109988162A (zh) * | 2017-12-29 | 2019-07-09 | 武汉兴华智慧医药科技有限公司 | 一种依匹哌唑衍生物及其制备方法 |
| CN114181202A (zh) * | 2021-12-17 | 2022-03-15 | 湖南省湘中制药有限公司 | 一种依匹哌唑的制备方法 |
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