CN114539100A - 一种特布他林衍生物d及其制备方法和应用 - Google Patents
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- C07C271/06—Esters of carbamic acids
- C07C271/40—Esters of carbamic acids having oxygen atoms of carbamate groups bound to carbon atoms of six-membered aromatic rings
- C07C271/42—Esters of carbamic acids having oxygen atoms of carbamate groups bound to carbon atoms of six-membered aromatic rings with the nitrogen atoms of the carbamate groups bound to hydrogen atoms or to acyclic carbon atoms
- C07C271/44—Esters of carbamic acids having oxygen atoms of carbamate groups bound to carbon atoms of six-membered aromatic rings with the nitrogen atoms of the carbamate groups bound to hydrogen atoms or to acyclic carbon atoms to hydrogen atoms or to carbon atoms of unsubstituted hydrocarbon radicals
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C215/00—Compounds containing amino and hydroxy groups bound to the same carbon skeleton
- C07C215/46—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups bound to carbon atoms of at least one six-membered aromatic ring and amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings of the same carbon skeleton
- C07C215/48—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups bound to carbon atoms of at least one six-membered aromatic ring and amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings of the same carbon skeleton with amino groups linked to the six-membered aromatic ring, or to the condensed ring system containing that ring, by carbon chains not further substituted by hydroxy groups
- C07C215/52—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups bound to carbon atoms of at least one six-membered aromatic ring and amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings of the same carbon skeleton with amino groups linked to the six-membered aromatic ring, or to the condensed ring system containing that ring, by carbon chains not further substituted by hydroxy groups linked by carbon chains having two carbon atoms between the amino groups and the six-membered aromatic ring or the condensed ring system containing that ring
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
本发明公开了一种特布他林衍生物D及其合成方法,所述特布他林衍生物D的结构如结构式(Ⅰ)所示,具体合成路线为:以3,5‑二甲氧基苯乙酸和叔丁胺为原料,通过缩合、还原、脱保护基、取代反应得到所述特布他林衍生物D。本发明所述特布他林衍生物D合成方法简单,合成过程中产生的中间体可作为特布他林杂质、最终产物可作为班布特罗杂质用于质量研究。
Description
技术领域
本发明属于有机化学领域,具体地,本发明涉及一种特布他林衍生物D及其制备方法和应用。
背景技术
特布他林化学名为5-(1-羟基-2-叔丁基氨基乙基)苯-1,3-二酚,是一种肾上腺素β2受体激动剂,可增加由于阻塞性肺病降低的黏液纤毛清洁功能,从而加速黏液分泌物的清除。临床上适用于支气管哮喘、慢性支气管炎、肺气肿和其它伴有支气管痉挛的肺部疾病。
班布特罗,是特布他林的前药,在体内可代谢为特布他林,从而使支气管平滑肌松弛,具有平喘作用,还具有抑制肥大细胞释放炎症介质的作用。在临床上可用于治疗哮喘,肺气肿,支气管炎等。
专利CN111440078A公开了多种特布他林衍生物的制备方法,其中包括5-[2-(叔丁基氨基)乙基]苯-1,3-二醇的制备方法:3,5-二甲氧基苯乙酸、叔丁胺在缩合剂的作用下反应,得到N-(叔丁基)-2-(3,5-二甲氧基苯基)乙酰胺,然后通过还原反应得到N-(3,5-二甲氧基苯乙基)-2-甲基丙烷-2-胺,最后脱保护基得到特布他林衍生物C,即5-[2-(叔丁基氨基)乙基]苯-1,3-二醇。该专利提供了多种特布他林衍生物的合成方法,但未提供特布他林衍生物的用途,具有一定局限性。
专利CN104262202A公开了一种班布特罗中间体的制备工艺,该制备工艺是以3,5-二羟基苯乙酮的化合物为原料,在碱试剂和催化剂的作用下,与N,N-二甲氨基甲酰氯反应,生成二-[3,5-(N,N-二甲氨基甲酰氧基)]-苯乙酮,该专利提供了一种制备班布特罗及其中间体的方法。
专利CN106187820B、CN105859589B以及专利CN107445866A公开了多种可用于质量研究的班布特罗杂质及其合成方法,具体包括杂质A、杂质C以及杂质D。
发明内容
本发明的目的在于提供一种新的特布他林衍生物,该衍生物可作为班布特罗的杂质,在合成过程中产生的中间体也可作为特布他林杂质用于质量研究,并且本发明还提供一种该衍生物的合成方法。
一种特布他林衍生物D,所述衍生物D的结构式如(I)所示:
所述特布他林衍生物D可作为班布特罗杂质用于质量研究。
一种特布他林衍生物D的合成方法:以3,5-二甲氧基苯乙酸和叔丁胺为原料,通过缩合、还原、脱保护基和取代反应得到特布他林衍生物D。
一种合成特布他林衍生物D的方法,其特征在于,包括以下步骤:
(1)3,5-二甲氧基苯乙酸和叔丁胺在缩合剂的作用下得到N-(叔丁基)-2-(3,5-二甲氧基苯基)乙酰胺,即中间体1;
(2)所述中间体1在还原剂作用下得到N-(3,5-二甲氧基苯乙基)-2-甲基丙烷-2-胺,即中间体2;
(3)所述中间体2在路易斯酸作用下脱去甲基保护基,再与盐酸成盐,得到5-[2-(叔丁基氨基)乙基]苯-1,3-二醇,即中间体3;
(4)所述中间体3采用氨基保护基进行保护,然后在DMAP的催化下与N,N-二甲氨基甲酰氯发生酯化反应,再脱去氨基保护基,得到特布他林衍生物D。
中间体3经过纯化可作为特布他林杂质用于质量研究。
一种合成特布他林衍生物D的方法,其特征在于,具体包括以下反应步骤:
(1)将3,5-二甲氧基苯乙酸、叔丁胺、缩合剂和溶剂加入到反应瓶中,在室温下反应,直至反应完全。所述反应液中加入提取溶剂,得到有机相,所述有机相用水洗至中性,然后减压浓缩得到中间体1;
(2)将所述中间体1用四氢呋喃溶解,降至0℃,滴加硼烷的四氢呋喃溶液,待反应完毕后将反应液倒入水中,加入提取溶剂,得到有机相,所述有机相用水洗至中性,然后减压浓缩得到中间体2;
(3)将所述中间体2和溶剂加入到反应瓶中,降至0℃,加入路易斯酸,直至反应完全。将反应液倒入水中,加入提取溶剂,得到有机层和水层。弃去所述有机层,将所述水层用氢氧化钠水溶液调节pH为碱性,具体范围为7.5~8.5,加入提取溶剂,得到有机层,将所述有机层减压浓缩得到中间体3。
(4)将所述中间体3和溶剂加入到反应瓶中,加入碱和(Boc)2O反应,反应完成后分液萃取,合并有机相,固液分离,纯化,得到中间体4;
(5)将所述中间体4和溶剂加入到反应瓶中,加入催化量的DMAP和过量的有机碱,搅拌得到反应液A,将所述反应液A缓慢加入得到N,N-二甲氨基甲酰氯中,然后升温反应,待反应完成后萃取干燥,得到中间体5;
(6)将中间体5溶解在溶剂中,加入盐酸低温反应,反应完成后通过分液萃取、纯化得到特布他林衍生物D;
优选地,所述合成方法中所用到的缩合剂包括但不限于EDCI(1-乙基-(3-二甲基氨基丙基)碳酰二亚胺盐酸盐)和HOBT(1-羟基苯并三唑)组合。
优选地,所述制备方法中用到的路易斯酸包括但不限于三溴化硼和三氯化铝。
一种合成特布他林衍生物D的方法,合成路线如下:
本发明提供了一种新的特布他林衍生物,该衍生物合成方法简单,可作为班布特罗杂质用于质量研究,在合成过程中产生的中间体3经过纯化也可作为特布他林杂质用于质量研究。
具体实施方式
为了更好理解本发明的技术方案和优点,以下通过具体实施方式对本发明做进一步说明。
实施例1
取250ml三口瓶,加入9.8g 3,5-二甲氧基苯基乙酸、叔丁胺7.3g、二氯甲烷50g,HOBT 6.7g、EDCI 11.5g,室温反应,HPLC监控直至反应完全。将反应液滴加至100g水中,二氯甲烷萃取,有机层用水洗至中性,静置分液,有机相减压浓缩得到液相纯度为98.0%的中间体1,约13g。
实施例2
取250ml三口瓶,将上述中间体1用13g四氢呋喃溶解,滴加硼烷的四氢呋喃溶液(150ml,1.0M),滴加完毕搅拌15分钟,然后回流反应,直至反应完全。再加入20g甲醇继续回流8h,减压除去溶剂。残留物中加入50g乙酸乙酯和100g水,再加入2ml浓盐酸调节PH<3,静置分液,有机层弃去。水层中加50g乙酸乙酯并用氢氧化钠调节PH=7.5~8.5,静置分液,水层弃去,有机层用水洗至中性。有机相减压浓缩得到纯度为95.0%的中间体2。
实施例3
取250ml三口瓶,加入中间体2和60g二氯甲烷,降温至0℃以下,滴加三溴化硼25g,滴加完毕搅拌15分钟,然后0℃以下搅拌3h,直至反应完全。将反应液倒入100g冰水中,静置分液,有机层弃去。水层中加50g乙酸乙酯并用氢氧化钠调节PH=7.5~8.5,静置分液,水层弃去,有机层用水洗至中性。有机相减压浓缩得到纯度为97.0%的中间体3。
实施例4
将中间体3溶解在DCM中,加入过量的TEA,然后加入1当量的(Boc)2O,室温反应直至反应完全。将反应液倒入水中,萃取分液、纯化,得到中间体4;将中间体4和60ml乙酸乙酯加入到反应瓶中,加入0.7g DMAP和8.0g TEA,搅拌2分钟得到混合溶液,然后在0℃将混合溶液缓慢加入到7.17g N,N-二甲氨基甲酰氯中,然后升温反应,反应完成后萃取干燥,得到中间体5。
实施例5
中间体5溶解在DCM中,加入1.2当量的盐酸,低温反应,反应完成后加水淬灭,调节水相的酸碱度,将产品萃取干燥后得到特布他林衍生物D粗品。取100ml单口瓶,加入特布他林衍生物D粗品8g、活性炭1g和甲醇16g,升温至50℃溶解澄清,过滤,滤液中加入4ml浓盐酸,搅拌30分钟,然后降至40℃析晶,当大量晶体析出后降温至0-10℃养晶1h。过滤,滤饼用鼓风干燥箱65℃烘干,得到高纯度的特布他林衍生物D。
需要说明的是,以上各实施例仅用以说明本发明的技术方案,而非对其限制;尽管参照前述各实施例对本发明进行了详细的说明,本领域的普通技术人员应当理解:其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分或者全部技术特征进行等同替换;而这些修改或者替换,并不使相应技术方案的本质脱离本发明各实施例技术方案的范围。
Claims (9)
2.根据权利要求1所述的特布他林衍生物D,其特征在于,所述衍生物D可作为班布特罗杂质用于质量研究。
3.一种特布他林衍生物D的合成方法,其特征在于,所述衍生物D是以3,5-二甲氧基苯乙酸和叔丁胺为原料,通过缩合、还原、脱保护基和取代反应得到。
4.一种合成特布他林衍生物D的方法,其特征在于,包括以下步骤:
(1)3,5-二甲氧基苯乙酸和叔丁胺在缩合剂的作用下得到N-(叔丁基)-2-(3,5-二甲氧基苯基)乙酰胺,即中间体1;
(2)所述中间体1在还原剂作用下得到N-(3,5-二甲氧基苯乙基)-2-甲基丙烷-2-胺,即中间体2;
(3)所述中间体2在路易斯酸作用下脱去甲基保护基,再与盐酸成盐,得到5-[2-(叔丁基氨基)乙基]苯-1,3-二醇,即中间体3;
(4)所述中间体3采用氨基保护基进行保护,然后在DMAP的催化下与N,N-二甲氨基甲酰氯发生酯化反应,再脱去氨基保护基,得到特布他林衍生物D。
5.一种合成特布他林衍生物D的方法,其特征在于,具体包括以下反应步骤:
(1)将3,5-二甲氧基苯乙酸、叔丁胺、缩合剂和溶剂加入到反应瓶中,在室温下反应,直至反应完全。所述反应液中加入提取溶剂,得到有机相,所述有机相用水洗至中性,然后减压浓缩得到中间体1;
(2)将所述中间体1用四氢呋喃溶解,降至0℃,滴加硼烷的四氢呋喃溶液,待反应完毕后将反应液倒入水中,加入提取溶剂,得到有机相,所述有机相用水洗至中性,然后减压浓缩得到中间体2;
(3)将所述中间体2和溶剂加入到反应瓶中,降至0℃,加入路易斯酸,直至反应完全。将反应液倒入水中,加入提取溶剂,得到有机层和水层。弃去所述有机层,将所述水层用氢氧化钠水溶液调节pH为碱性,加入提取溶剂,得到有机层,将所述有机层减压浓缩得到中间体3。
(4)将所述中间体3和溶剂加入到反应瓶中,加入碱和(Boc)2O反应,反应完成后分液萃取,合并有机相,固液分离,纯化,得到中间体4;
(5)将所述中间体4和溶剂加入到反应瓶中,加入催化量的DMAP和过量的有机碱,搅拌得到反应液A,将所述反应液A缓慢加入得到N,N-二甲氨基甲酰氯中,然后升温反应,待反应完成后萃取干燥,得到中间体5;
(6)将中间体5溶解在溶剂中,加入盐酸低温反应,反应完成后通过分液萃取、纯化得到特布他林衍生物D;
6.如权利要求4或5任意一项所述合成特布他林杂质D的方法,其特征在于,所述缩合剂为EDCI和HOBT组合物。
7.如权利要求4或5任意一项所述合成特布他林杂质D的方法,其特征在于,所述路易斯酸为三溴化硼和/或三氯化铝。
8.如权利要求5所述合成特布他林衍生物D的方法,其特征在于,所述步骤(3)中调节pH至7.5~8.5。
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