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WO2009046581A1 - Procédé de résolution d'acide (6r,s)-5-formyltetrahydrofolique et sa salification - Google Patents

Procédé de résolution d'acide (6r,s)-5-formyltetrahydrofolique et sa salification Download PDF

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Publication number
WO2009046581A1
WO2009046581A1 PCT/CN2007/003074 CN2007003074W WO2009046581A1 WO 2009046581 A1 WO2009046581 A1 WO 2009046581A1 CN 2007003074 W CN2007003074 W CN 2007003074W WO 2009046581 A1 WO2009046581 A1 WO 2009046581A1
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Prior art keywords
cho
thf
tetrahydrofolate
formyl
salt
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French (fr)
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Xin Chen
Yicheng Mei
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Nanjing Rally Biochemical Inc
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Nanjing Rally Biochemical Inc
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    • CCHEMISTRY; METALLURGY
    • C07ORGANIC CHEMISTRY
    • C07DHETEROCYCLIC COMPOUNDS
    • C07D475/00Heterocyclic compounds containing pteridine ring systems
    • C07D475/02Heterocyclic compounds containing pteridine ring systems with an oxygen atom directly attached in position 4
    • C07D475/04Heterocyclic compounds containing pteridine ring systems with an oxygen atom directly attached in position 4 with a nitrogen atom directly attached in position 2

Definitions

  • the present invention relates to the field of organic pharmaceutical chemistry, and in particular to a method for the resolution of an organic drug (6R,S)-5-formyl-tetrahydrofolate and its salt formation.
  • (6S)-5-formyl-tetrahydrofolate chemical name N-5-formyl (6S)-5,6,7,8-tetrahydrofolate, ie (6S)-5-CHO-THF, abbreviation (6S)-leucovorin, a configuration that occurs naturally (eg, in the liver).
  • 6S calcium salt structure is as follows -
  • the commercially available drug leucovorin is a calcium salt of folinic acid in the (6R, S) configuration
  • medical research has shown that: chemically synthesized diastereomer (6R, S)-colate is used in the treatment of cancer. It is half of natural (6S)-folate, but the toxicity is twice.
  • 6R, S chemically synthesized diastereomer
  • the object of the present invention is to establish a simple and industrially suitable process for the preparation of (6S 5-CHO-THF ⁇ Ca).
  • the (6R,S)-CHO-THF ⁇ Ca aqueous solution can be salted with R-(+)-a-phenethylamine to precipitate the corresponding (6R)-CHO-THF ⁇ ⁇ -(+)- ⁇ - Phenylethylamine salt, removed by filtration.
  • Add cyclohexane to the filtrate and adjust the pH to 3 ⁇ 4 with hydrochloric acid (concentrated hydrochloric acid: water 1: 1), add cyclohexane, separate the organic layer (cyclohexane), and distill off the cyclohexane after vacuum distillation.
  • An aqueous calcium chloride solution was isolated by ethanol to obtain a (6S)-5-CHO-THF calcium salt.
  • organic base is used as a resolving agent as an optical isomer of (+) or N-ethyl-2-aminomethylpyrrole.
  • the organic solvent for extracting (6S)-5-CHO-THF is toluene, ethyl acetate, or cyclohexane, preferably cyclohexane.
  • the alcohol which is isolated from the (6S)-5-CHO-THF salt may also be methanol, ethanol, isopropanol or ethylene glycol, preferably ethanol.
  • (6S)-5-CHO-THF calcium, magnesium or sodium salt can also be prepared by using Ca(OH) 2 , Mg 2 Cl, dilute NaOH solution.
  • the drug for treating Alzheimer's disease (6S)-5-methyl-tetrahydrofolate (6S-5-MTHF ⁇ Ca) can be prepared. .

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Description

(6R,S)-5-甲酰 -四氢叶酸的拆分及其成盐的方法
发明领域
本发明涉及有机药物化学领域, 具体而涉及到一种有机药物 (6R,S)-5-甲酰-四氢叶酸的拆分及其成盐的方法。
背景技术
(6S)-5-甲酰 -四氢叶酸, 化学名称为 N-5-甲酰基 (6S)-5,6,7,8-四氢 叶酸, 即 (6S)-5-CHO-THF, 简称 (6S)-亚叶酸, 是天然存在 (例如肝中) 的构型。 其钙盐结构式如下-
Figure imgf000002_0001
目前, 市场上供应的药物亚叶酸钙全是 (6R,S)构型的亚叶酸的钙 盐, 医药学研究表明: 化学合成的非对映体 (6R,S)-亚叶酸钙在治疗癌 症中是天然 (6S)-亚叶酸钙的一半,而毒性却是二倍。(RM.Sirotanketal., Biochemical Pharmacology 28,2993-2997, 1979;C.Temple etal.,Cancer Treatment Reports 65, 1117- 1119, 1981 )。
因此, 在合成 (6R,S)-5-CHO-THF-Ca时, 拆分获得与天然的活性 物质一致的 (6S)-5-CHO-THF及其盐的十分必要的。
为 了 从(6R,S)-5-CHO-THF 拆分得 到 (6S)-5-CHO-THF , Hans.R.Muller等人 (U.S. 5,010,194,1991)在 (6R,S)-5-CHO-THF盐水溶 液中加入无机酸或有机酸的水溶液或碱金属, 碱土金属盐或铵盐后, 由 占优势 的 非对 映 体(6R)-5-CHO-THF 盐组 成相 应 的 (6R)-5-CHO-THF盐, 将析出的相应的 (6R)-5-CHO-THF盐过滤除去, 再用离析方法将滤液中 的(6S 5-CHO-THF 盐得到固体 (6S)-5-CHO-THF盐。 而该专利中提到的 "铵盐"仅为: 吡咯垸鐺, 哌啶鎗和吗啉鎿盐。
发明内容
本发明的目的是确立一种制备 (6S 5-CHO-THF · Ca 的简单的和 适于工业上使用的方法。
令人惊奇地发现: 向 (6R,S) -CHO-THF · Ca水溶液中加入有机碱 S-(-)-a-苯乙胺,. 析出相应的 (6S)-CHO-THF · S-(-)-a-苯乙胺盐沉淀, 将该盐溶于环己烷用盐酸 (浓盐酸:水 = 1 :1)调 pH到 3〜4,加入有机 溶剂环己垸。 分取有机层 (环己垸), 减压蒸去环己垸, 加入氯化钙水 溶液,乙醇离析,得到 (6S)-5-CHO-THF钙盐。
另外也可以用 R-(+)-a-苯乙胺将 (6R,S) -CHO-THF · Ca水溶液成 盐, 析出相应的 (6R)-CHO-THF · Ε -(+)-α-苯乙胺盐, 过滤除去。 在滤 液中加入环己垸用盐酸 (浓盐酸:水 = 1: 1 )调 pH到 3〜4,加入环己垸, 分取有机层 (环己烷), 减压蒸去环己垸, 加入氯化钙水溶液, 用乙醇 离析, 得到 (6S)-5-CHO-THF钙盐。
进一步地, 有机碱作为拆分剂还有 (+)或 的 N-乙基- 2-氨甲基吡 咯垸二个的光学异构体。 提取 (6S)-5-CHO-THF的有机溶剂是甲苯, 乙酸乙酯, 或环己烷, 优选环己烷。
离析 (6S)-5-CHO-THF盐的醇类也可以使用甲醇, 乙醇, 异丙醇, 或乙二醇, 优选乙醇。
同样的方法, 用 Ca(OH)2,Mg2Cl,稀 NaOH溶液也可以制成相应的 (6S)-5-CHO-THF钙, 镁或钠盐。
本发明以 (6S)-5-CHO-THF * Ca经还原反应后, 即可制备治疗老 年痴呆症的药物 (6S)-5-甲基 -四氢叶酸钙 (6S-5-MTHF · Ca)。
具体实施方式
下面通过实施例对本发明作进一步说明。 应该理解的是,本发明 实施例所述制备方法仅仅是用于说明本发明,而不是对本发明的限制, 在本发明的构思提前下对本发明制备方法的简单改进都属于对本发 明要求保护的范围。 除非另有说明,本发明中的百分数是重量百分数。 实施例一
在反应瓶中加入(6R,S)-5-CHO-THF · Ca 102.3g(0.2mol) , 水 300ml, S-(-)-a-苯乙胺 28.0g(0.2mol),加热至 70°C, 使全溶, 冷至 10°C, 有结晶析出, 过滤得到 (6S)-5-CHO-THF · S-(-)-a-苯乙胺盐粗 品, 用 50%乙醇重结晶。
将上述 6S · S- (-) -a-苯乙胺盐溶于 300ml水中, 再加入 200ml环 己烷, 用 18%盐酸调 pH至 3〜4, 分取环己垸层, 减压蒸去环己烷, 将浓缩液加入氯化钙水溶液,加入活性炭过滤,冷至 10°C,加入 200ml 乙醇离析,得到较纯的 (6S)-5-CHO-THF -Ca,得量 45.2g,收率 44.2%, [a]20 D=-15.0。(C=l,H2O),纯度 (HPLC) 98.5%。 实施例二
实验操作同实施例一, 以氢氧化钙的水悬浮液代替氯化钙水溶 液, 得到(6S)-5-CHO-THF · Ca, 得量 45.5g, 收率 44.5 %, [a]20 D=-15.1°(C=1.82,H2O),纯度 (HPLC) 98.5%。
实施例三
在反应瓶中加入 (6R,S)-5-CHO-THF · Ca 102.3g(0.2mol) , 水 300ml, R-(+)-a-苯乙胺 28.0g(0.2mol),加热至 70 °C,使全溶,冷至 10°C, 有结晶析出, 过滤除去生成的 (6R)-5-CHO-THF · R-(+)-a-苯乙胺盐。 将滤液用用 18%盐酸调 pH至 3〜4, 加入到 300ml环己烷中, 分取 环己烷层,减压蒸去环己垸,将浓缩液加入氯化钙水溶液,冷至 10°C, 加入 200ml乙醇离析,得到较纯的 (6S)-5-CHO-THF -Ca,得量 43.6g, 收率 42.6%, [a]2D=-14.9。(01,H20),纯度 (HPLC) 98.5%。

Claims

权 利 要 求 书
1 . 一种拆分 (6R,S)-5-甲酰-四氢叶酸盐的方法, 其中使用光学活性有 机碱作为拆分剂, 使之成盐,过滤,酸化,用有机溶剂提取,加入 CaCl2 或 Ca(OH)2,Mg2Cl,NaOH水溶液浓縮,生成 (6S)-5-甲酰-四氢叶酸盐,用 醇类离析结晶。
2. 根据权利要求 1的方法, 制备 (6R,S)-5-甲酰-四氢叶酸有机盐的拆 分剂是 R-(+)-a-苯乙胺或 S-(-)-a-苯乙胺; 或 (+)N-乙基 -2-氨甲基吡咯 烷或 (-) N-乙基 -2-氨甲基吡咯垸。
3.根据权利要求 1的方法, 提取 (6S)-5-甲酰 -四氢叶酸的有机溶剂是: 环己垸, 甲苯, 或醋酸乙酯。
4. 根据权利要求 1的方法, (6S)-5-甲酰-四氢叶酸可以分别与 CaCl2, Ca(OH)2,Mg2Cl,或 NaOH水溶液成相应的盐。
5. 根据权利要求 1的方法, 离析 (6S)-5-甲酰-四氢叶酸盐的醇类可以 使用乙醇, 甲醇, 异丙醇, 或乙二醇。
PCT/CN2007/003074 2007-10-11 2007-10-29 Procédé de résolution d'acide (6r,s)-5-formyltetrahydrofolique et sa salification Ceased WO2009046581A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101863889B (zh) * 2009-04-20 2013-07-03 重庆华邦胜凯制药有限公司 左亚叶酸钙的纯化方法
CN103102350A (zh) * 2011-11-11 2013-05-15 重庆华邦胜凯制药有限公司 一种左亚叶酸盐的制备方法
CN103214487A (zh) * 2013-04-12 2013-07-24 张家港威胜生物医药有限公司 一种重要医药化工原料(6s)-5-甲基四氢叶酸盐的合成
CN105367574A (zh) * 2015-10-27 2016-03-02 浙江大为药业有限公司 一种高纯度左旋亚叶酸钙的制备工艺
CN111620777A (zh) * 2020-06-10 2020-09-04 成都蓝蜻蜓生物技术有限公司 一种(s)-1,2,3,4-四氢-1-萘甲酸的拆分方法
CN113666931B (zh) * 2021-09-07 2023-11-03 浙江大为药业有限公司 一种高纯左亚叶酸钙的制备方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688018A (en) * 1952-06-28 1954-08-31 American Cyanamid Co Method of preparing alkaline earth metal salts of 1-leucovorin
CN88102709A (zh) * 1987-05-15 1988-12-28 阿泼洛发公司 亚叶酸的分离方法
CN1038813A (zh) * 1988-06-29 1990-01-17 爱泼洛瓦股份公司 制备四氢叶酸盐的方法
CN1063285A (zh) * 1991-01-16 1992-08-05 埃普罗瓦股份公司 (6s)-和(6r)四氢叶酸的制备方法
US5457202A (en) * 1991-11-11 1995-10-10 Knoll Aktiengesellschaft Resolution of 5-methyltetrahydrofolic acid
IT1254954B (it) * 1992-04-30 1995-10-11 Processo per preparare la forma otticamente attiva (6-s) dell'acido folinico ottenuto per via sintetica

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688018A (en) * 1952-06-28 1954-08-31 American Cyanamid Co Method of preparing alkaline earth metal salts of 1-leucovorin
CN88102709A (zh) * 1987-05-15 1988-12-28 阿泼洛发公司 亚叶酸的分离方法
CN1038813A (zh) * 1988-06-29 1990-01-17 爱泼洛瓦股份公司 制备四氢叶酸盐的方法
CN1063285A (zh) * 1991-01-16 1992-08-05 埃普罗瓦股份公司 (6s)-和(6r)四氢叶酸的制备方法
US5457202A (en) * 1991-11-11 1995-10-10 Knoll Aktiengesellschaft Resolution of 5-methyltetrahydrofolic acid
IT1254954B (it) * 1992-04-30 1995-10-11 Processo per preparare la forma otticamente attiva (6-s) dell'acido folinico ottenuto per via sintetica

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