CN107325066A - 雷美替胺中间体的拆分方法 - Google Patents
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Abstract
本申请旨在提供雷美替胺中间体的拆分方法。本方法以价格低廉的光学纯的手性酸拆分(±)‑2‑(1,6,7,8‑四氢‑2H‑茚并[5,4‑b]呋喃‑8‑基)乙胺制备高光学纯度的(S)‑2‑(1,6,7,8‑四氢‑2H‑茚并[5,4‑b]呋喃‑8‑基)乙胺。本方法操作简便,适于工业化生产。
Description
技术领域
本申请属于药物化学领域。
背景技术
(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺是制备雷美替胺的关键中间体,雷美替胺是由日本五田公司研发的口服催眠药物,是第一个应用于临床治疗失眠的褪黑激素受体激动剂。雷美替胺分子中含有一个手性中心,(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺在经过丙酰化后即得到雷美替胺,所以制备高光学纯度的(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺对于控制雷美替胺立体异构体的意义十分重要。
,
(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的合成方法,已见到文献资料报道的主要是高压不对称氢化的方法。日本专利JP11140073报道了以Ru2Cl4[(R)-BINAP]2Net3为手性催化剂,氢气压力在100atm下,不对称还原(E)-2-(1,2,6,7-四氢-8H-茚并[5,4-b]呋喃-8-亚基)乙胺盐酸盐得到(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的盐酸盐,ee值为88.88%。经过在甲醇和丙酮的混合溶剂中重结晶两次后得到ee值为100%的产品,还原和重结晶的总收率为68%。反应式如下:
。
另一方法,以2-(1,6二氢-2H-茚并[5,4-b]呋喃-8-基)乙酰胺为原料,Ru(OAc)2[(R)BINAP]为手性催化剂,不对称还原得到(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙酰胺,ee值为92%。在经过还原酰胺基后得到(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺(JP11080106)。反应式如下:
以上不对称催化还原的方法均采用了价格昂贵的手性均相钌催化剂,并且需要高压氢化,实际生产中对生产设备的要求较高,安全性上存在不足。
发明内容
本申请的目的是以价格低廉具有光学活性的有机酸为拆分试剂拆分(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺,制备其光学纯的S异构体,使之操作简便、安全、更适合工业化生产。
该方法包括:将(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺与光学纯的有机酸成盐;加热下,将(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺有机酸盐溶于适当的溶剂,冷却析晶。
本申请采用的拆分试剂为光学纯的有机酸,拆分(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺,得到高光学纯度的(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺。这些有机酸包括L-(-)-苹果酸、S-布洛芬、L-(-)-酒石酸、L-(-)-二本甲酰酒石酸、L-(-)-二对甲苯甲酰酒石酸、L-(-)-樟脑磺酸、D-(-)-扁桃酸等有机酸。光学有机酸的用量与被拆分的消旋体的摩尔比在1:1~1:1.5之间。
通过拆分试剂的作用,形成了对应的(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺和(R)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的非对应异构体的有机酸盐。利用在溶剂中溶解度不同来分离这些非对应异构体的有机酸盐,将(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺拆分,得到高光学纯度的(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺。
这里所用的溶剂包括,常用溶剂为:醇类,甲醇、乙醇、1-丙醇、2-丙醇;酮类,丙酮、甲基异丁酮;脂类,乙酸乙酯、乙酸丁酯;芳烃,苯、甲苯、二甲苯;脂肪烃,正己烷、正庚烷、环己烷;醚类,乙醚、四氢呋喃、四氢吡喃、叔丁基甲基醚;乙腈;水;或上述混合溶剂;优选溶剂为水、甲醇、乙醇、乙腈、丙酮、乙酸乙酯、二异丙基醚或其混合物。
溶剂的用量的变化取决于溶剂的类型、溶解度和结晶温度,因此,溶剂用量不能明确限定。根据所用溶剂和类型及其溶剂温度,可适当选择结晶温度。
本申请的拆分方法实施如下,将(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺溶解在适当的溶剂中,配置成溶液。再将光学纯的有机酸溶解在适当的溶剂当中,开启搅拌。常温下,滴加上述(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的溶液。滴加完毕后,加热到适当的温度,反应适当时间,使之完全反应完全,将所得溶液冷却至5℃,冷却后结晶析出,抽滤,40℃下干燥2h,取出,将固体溶解在适合的溶剂中,升高温度使固体全部溶解,使溶液达至过饱和状态,冷却析出的结晶,其中含(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺与光学纯有机酸所形成的盐的比例高于(R)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺与光学纯有机酸所形成的盐的比例。分离出结晶后,将所得的结晶溶解在适量的1M氢氧化钠溶液中,以适当的溶剂萃取后,无水硫酸钠干燥,蒸去溶剂后,得到高光学纯度的(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺产品。
具体实施方式
下面结合具体实施例对本申请作进一步的说明,但本申请的保护范围并不局限于此。
实施例1
取(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺40g(0.197mol)溶解在90ml的乙醇中。常温下滴加上述(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的乙醇溶液,滴加完毕后,升温至55℃,搅拌反应2小时。缓慢冷却至0~5℃后,过滤。滤饼干燥后加入到少量乙腈/乙醇=3/2混合溶剂中,加热到回流,补加乙腈/乙醇=3/2混合溶剂,直至固体全部溶解,冷却至0~5℃析晶,过滤,得晶体48.8g。
搅拌下,将上述48.8g的结晶缓慢加入到100mL的1M的氢氧化钠溶液中,在加入乙酸乙酯萃取三次(100mL×3),合并乙酸乙酯相,无水硫酸钠干燥后,蒸馏除去溶剂,得(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺产品15.4g,收率38.5%,光学纯度99.90%。
实施例2
取(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺40g(0.197mol)溶解在60mL的乙腈中。在500毫升三口瓶中,加入一水合L-(-)-二苯甲酰酒石酸(81g,0.21mol)和300mL乙腈,开启搅拌。常温下滴加上述(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的乙腈溶液,滴加完毕后,升温至60℃,搅拌反应1.5小时。缓慢冷却至0~5℃后,过滤。滤饼干燥后加入到少量乙腈/甲醇=8/3混合溶剂中,加热到回流,补加乙腈/甲醇=8/3的混合溶剂,直至固体全部溶解,冷却至0~5℃析晶,过滤,得结晶43.6g。
搅拌下,将上述43.6g的结晶缓慢加入到100mL的1M氢氧化钠溶液中,再加入乙酸乙酯萃取三次(100mL×3),合并乙酸乙酯相,无水硫酸钠干燥后,蒸除溶剂,得(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺产品14.6g,收率为36.5%,光学纯度99.92%。
实施例3
取(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺40g(0.197mol)溶解在40mL的甲醇中。在500毫升三口瓶中,加入S-布洛芬(47.4g,0.23mol)和200mL乙腈,开启搅拌。常温下滴加上述(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺的乙腈溶液,滴加完毕后,常温搅拌反应2.0h。过滤。滤饼干燥后加入到少量乙腈/甲醇=3/1混合溶剂中,加热到回流,补加乙腈/甲醇=3/1的混合溶剂,直至固体全部溶解,10~15℃析晶,过滤,得结晶59.1g。
搅拌下,将上述59.1g的结晶缓慢加入到100mL的1M氢氧化钠溶液中,再加入乙酸乙酯萃取三次(100mL×3),合并乙酸乙酯相,无水硫酸钠干燥后,蒸除溶剂,得(S)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺产品16.4g,收率为40.1%,光学纯度99.88%。
Claims (5)
1.雷美替胺中间体的拆分方法,
(1)将(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺与光学纯的有机酸成盐;
(2)加热,(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺有机酸盐完全溶于热的溶剂中,冷却,析晶。
2.根据权利要求1所述拆分方法,有机酸选自S-布洛芬。
3.根据权利要求1所述拆分方法,有机酸与(±)-2-(1,6,7,8-四氢-2H-茚并[5,4-b]呋喃-8-基)乙胺摩尔比为1:1.2 -1:1.5。
4.根据权利要求1所述拆分方法,溶剂选自水、甲醇、乙醇、乙腈或其混合溶剂。
5.根据权利要求1所述拆分方法,析晶温度是-10~0℃。
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