CN102477007B - 一种制备(s)-n-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法 - Google Patents
一种制备(s)-n-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法 Download PDFInfo
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- 239000002904 solvent Substances 0.000 claims description 28
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 27
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- DKWNMCUOEDMMIN-PKOBYXMFSA-N melagatran Chemical compound C1=CC(C(=N)N)=CC=C1CNC(=O)[C@H]1N(C(=O)[C@H](NCC(O)=O)C2CCCCC2)CC1 DKWNMCUOEDMMIN-PKOBYXMFSA-N 0.000 description 1
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Classifications
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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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/55—Design of synthesis routes, e.g. reducing the use of auxiliary or protecting groups
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- Indole Compounds (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
本发明提供一种制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法。以N-保护的-L-天门冬氨酸为起始原料,经过多聚甲醛成五元环保护一个羧基生成单羧酸化合物b,化合物b在甲醇钠的甲醇溶液中生成单酯化产物化合物c,化合物c的羧基通过乙氧羰基活化,然后硼氢化钠还原得到化合物d,然后化合物d的羟基经过甲磺酰(Ms)活化得到化合物e,脱保护关环得到化合物f,最后碱性条件下水解,得到目标产物化合物g。
Description
技术领域
本发明涉及一种重要医药中间体或者精细化学品的合成,具体的说是涉及一种制备S-N-保护基-氮杂环丁烷-2-羧酸的新方法。
背景技术
S-氮杂环丁烷-2-羧酸是一种重要的医药中间体存在于很多天然产物中(如:mugineic acid;或者nicotianamine)。作为医药中间体可以用于合成凝血酶抑制剂Melagatran或者Exenta,在多肽化学上作为脯氨酸的一种低级同系物。在不对称催化合成上可以用于酮的不对称还原(Tetrahedron:Asymmetry 1992,3,859;Angew.Chem.Int.Ed.1998,37,1986);迈克尔加成(J.Org.Chem.1996,61,3520.);环丙烷化(Tetrahedron 1998,54,629.);以及Diels-Alder反应(Tetrahedron 1998,54,4991.)等。
目前它的合成方法主要有以下几种:
以丁内酯为原料在红磷的催化下与溴单质反应,得到2,4-二溴丁酸,然后用苄醇酯化得到2,4-二溴丁酸苄酯;然后用苄胺关环得到N-保护的消旋氮杂环丁烷-2-羧酸苄酯,氢化脱掉保护基得到消旋体,后用酒石酸拆分得到目标产物。该方法原料易得廉价,但是反应后处理麻烦,副产物较多,不适合工业化生产。(J.Heterocyclic.chemistry,6,1969,993)
以L-天门冬氨酸为原料合成,经酯化后关环得到环状内酰胺羧酸酯,然后使用四氢铝锂还原得到氨基醇:S-氮杂环丁烷-2-羟甲基,然后羟甲基氧化得到目标产物。该方法还原剂价格较贵,且需要在无水条件下进行,对溶剂及湿度的要求较高且难于工业化。(如US6150535)。
以L-甲硫氨酸为原料,依次通过碘甲烷,弱碱条件将甲硫基变成羟基,然后通过一系列的反应关环,脱保护等得到氮保护的氮杂环丁烷-2-羧酸,过程需要柱层析以及使用氢化铝锂,碘甲烷等昂贵试剂。(如CN1393442A)。
以N-对甲苯磺酰基-L-高丝氨酸内酯为起始原料,经氢溴酸在乙醇溶液里开环得到4-溴代-2-N-对甲苯磺酰基-丁酸乙酯,然后在钠氢条件下关环,最后脱掉保护得到S-氮杂环丁烷-2-羧酸。该方法也会遇到L-高丝氨酸的合成局限。(Chem.Letters,1973,5)
通过手性辅剂以及酶催化水解的方法(如下图Scheme1)。以已知的化合物a转酯化得到二甲酯化合物b,化合物b碱性条件下与1,2-二溴乙烷关环得到化合物c,脱羧基得到一对非对映异构体D1,D2,然后酶催化下选择性水解得到化合物e,最后氢化脱掉氮上的手性辅剂得到目标产物。次方案副产物较多,需要柱层析纯化,且使用酶催化水解要求高,难以放大。(Biosci.biotechnol.biochem.,69,2005,1892)
发明内容
为解决上述问题,本发明的目的在于克服上述不足,提供一种原料易得,成本降低,且工艺容易操作,反应条件温和,不需要特殊处理,操作简单,更适合工业化生产的制备S-N-保护基-氮杂环丁烷-2-羧酸的新方法。
为达到上述目的,本发明的技术方案是:一种制备S-N-保护基-氮杂环丁烷-2-羧酸的新方法,其以N-保护的L-天门冬氨酸为起始原料,包括以下步骤:
上述步骤中,化合物a为N-Cbz-L-天门冬氨酸;化合物b为(R)-2-(3-(N-苄氧羰基)-5-氧-1,3-氧氮杂环丁烷基)乙酸;化合物c为N-Cbz-天门冬氨酸单甲酯;化合物d为(S)-2-N-Cbz-氨基-4-羟基丁酸甲酯;化合物e为(S)-2-N-Cbz-氨基-4-甲磺酸酯基丁酸甲酯;化合物f为(S)-N-烷氧羰基-氮杂环丁烷-2-羧酸甲酯;化合物g为(S)-N-保护基-氮杂环丁烷-2-羧酸;
i为多聚甲醛、对甲苯磺酸和溶剂甲苯;ii为甲醇钠和甲醇;iii为分步骤条件,第一步:乙氧酰氯、有机碱和溶剂;第二步:硼氢化钠和四氢呋喃;iv为TsCl或者MsCl、有机碱和溶剂;v为分步骤条件,第一步:氢气,10%的钯碳,以及溶剂甲醇、盐酸或甲磺酸;第二步:碳酸氢钠,甲醇和水,或异丙醇和水;第三步:二叔丁氧酰基碳酸酐或者苄氧酰氯,三乙胺,溶剂为甲醇,四氢呋喃,或者二氯甲烷;vi为氢氧化钠或者氢氧化钾,溶剂为甲醇或者水等。
优选的,由所述化合物a合成到所述化合物b的步骤具体为,以N-苄氧羰基保护的L-天门冬氨酸为原料,以甲苯为溶剂,对甲基苯磺酸催化,通过多聚甲醛关环得到化合物b。
优选的,由所述化合物b合成到所述化合物c的步骤具体为,化合物化合物b在甲醇钠的甲醇溶液中生成单酯化产物化合物c。
优选的,在由所述化合物c合成到所述化合物d的步骤具体为,化合物c的羧基通过生成混合酸酐活化,在硼氢化钠作为还原剂的条件下生成醇羟基得到化合物d。
优选的,在由所述化合物c合成到所述化合物d的步骤过程中,制备混合酸酐的酰氯为乙氧酰氯,有机碱为三乙胺,溶剂为二氯甲烷。
优选的,在由所述化合物d合成到所述化合物e的步骤过程中,化合物d的羟基在有机碱的条件下使用MsCl活化得到化合物e,所述有机碱为三乙胺、吡啶、二异丙基乙胺或者N-甲基马菲林,所述溶剂为二氯甲烷、四氢呋喃或吡啶。
优选的,在由所述化合物e合成到所述化合物f的步骤过程中,化合物e在10%的钯碳,以及氢气的条件下脱掉氮保护基,然后在碱性条件下关环得到化合物f。
优选的,在由所述化合物e合成到所述化合物f的步骤过程中,化合物e脱掉氮保护基的溶剂为甲醇、乙醇或者适量的酸,所述碱性条件下关环采用无机碱,所述无机碱为碳酸氢钠或碳酸氢钾,溶剂是甲醇和水,或者乙腈。
优选的,所述环化的温度在50-80℃。
优选的,环化后产物的N直接进行保护生成N-保护的氨基酸甲酯即化合物f,化合物f的酯基在碱性条件下水解生成目标产物g,碱为氢氧化钠或氢氧化钾,溶剂为醇或者水。
采用本技术方案的有益效果是:原料易得,每一步都使用常用的廉价工业化试剂,使用硼氢化钠还原较使用四氢铝锂成本降低,且工艺容易操作,与已经发表的文献相比,反应条件温和,不需要特殊处理,操作简单,更适合工业化生产。
具体实施方式
下面结合具体实施方式对本发明作进一步详细的说明。
实施例,
步骤一,(R)-2-(3-(N-苄氧羰基)-5-氧-1,3-氧氮杂环丁烷基)乙酸即化合物b的合成:
在250mL圆底烧瓶中加入Cbz-N-天门冬氨酸甲酯(13.4g,0.05mol),多聚甲醛(4.8g),催化量的对甲苯磺酸(1g,0.005mol)以及150mL甲苯。然后套上回流冷凝管,加热回流4个小时TLC显示反应已不再进行。浓缩掉甲苯,反应物用150mL乙酸乙酯溶解,然后5%的碳酸氢钠溶液(50mLx3)萃取,水层在冰浴条件下用2N的盐酸酸化到pH为2-3左右。然后用乙酸乙酯(50mLx3)萃取,有机相无水硫酸钠干燥,浓缩后得到13.1g淡黄色糖浆。
步骤二,N-Cbz-天门冬氨酸单甲酯即化合物c的合成:
250mL三颈烧瓶中加入0.1M的甲醇钠的甲醇溶液(940mL,0.094mol),在氮气保护的干燥条件下体系冰浴冷却到0℃,然后将上步骤所得淡黄色油状物(13.1g,0.047mol)溶解在20mL无水甲醇中滴入上述冷却体系中,大约30分钟滴加完毕。0℃下搅拌反应1h,升到室温后加热回流3h。后冷却到室温加入0.5M稀盐酸(120mL)调到弱酸性,然后浓缩掉甲醇,水相用乙酸乙酯萃取(50mLx3),无水硫酸钠干燥后浓缩得单酯化产物化合物c11.8g,产率90%。未经纯化直接用于下步反应。
步骤三,(S)-2-N-Cbz-氨基-4-羟基丁酸甲酯即化合物d的合成
上述所得单酯化产物化合物c(10g,0.036mol)溶解在无水THF(50mL)里,冰盐浴冷却到-10℃,然后加入N-甲基马菲林(3.64g,0.036mol)。体系搅拌5分钟后滴加乙氧酰氯(3.9g,0.036mol)滴加完毕后-10℃搅拌15min。加入硼氢化钠(2.72g,0.072mol),然后维持在0℃以下缓慢滴加甲醇(40mL),大约15min滴完。然后体系在冷却下搅拌30min,撤掉冰浴,室温搅拌1h。然后在冰浴下加入1N HCl 50mL淬灭反应。浓缩掉溶剂,水相用乙酸乙酯萃取(50mLx3)。有机相分别依次用1NHCl(30mLx2)洗涤,水(50mL)洗,5%碳酸氢钠洗(30mLx2)以及盐水50mL洗。最后无水硫酸钠干燥浓缩后得到淡黄色油状物。柱层析(乙酸乙酯和石油醚洗脱)得无色油6.5g,产率67%。1H-NMR(400M,CDCl3)ppm7.50-7.40(m,5H),5.71(d,1H,J=7.5Hz),5.26-5.10(m,2H),4.66(m,1H),3.86(s,3H),3.86-3.73(m,2H),2.45(br,1H),2.30-2.22(m,1H),1.86-1.78(m,1H)。
步骤四,N-Cbz-O-甲磺酸酰基-L-高丝氨酸甲酯即化合物e的合成:
上步所得粗产物N-Cbz-L-高丝氨酸甲酯(6g,22.4mmol)溶解在二氯甲烷50mL里冷却到0℃,然后加入三乙胺(3.4g,33.6mmol)搅拌10min,然后滴入甲磺酰氯(3.08g,27.0mmol)混合物在0℃搅拌1h,然后于室温下搅拌一个小时。反应完全后体系加入二氯甲烷稀释(100mL),有机层依次用水洗(50mLx2),1N盐酸洗(30mLx3),饱和碳酸钠洗(50mLx2)盐水洗(50 mL)。无水硫酸钠干燥,浓缩后得到淡黄色油状物7.7g,产率99%。1H-NMR(400MHz,CDCl3):ppm7.40-7.34(m,5H),5.71(d,J=6.0Hz,1H),5.21(s,2H),4.60(m,1H),4.38(m,2H),3.86(s,3H),2.96(s,3H),2.38(m,1H),2.24(m,1H)。
步骤五,N-叔丁氧羰基-S-氮杂环丁烷-2-羧酸即化合物g的合成:
上步所得N-Cbz-O-甲磺酸酰基-L-高丝氨酸甲酯(7g,20.3mmol)溶解在50mL甲醇里,加入10%Pd/C0.7g,浓盐酸1.7mL。室温下常压氢化过夜。过滤,浓缩后得N脱保护产物O-甲磺酸酰基-L-高丝氨酸甲酯的甲醇溶液。然后力入饱和的碳酸氢钠溶液(20mL),体系在50-80℃加热反应6h得到环化产物氮杂环丁烷-2羧酸甲酯。然后旋掉体系溶剂,乙酸乙酯萃取(30mLx3),无水硫酸钠干燥浓缩后为黏稠液体,然后加入50mL甲醇稀释得淡黄色溶液。
上述溶液中加入三乙胺(7mL,50mmol),搅拌15min后加入二叔丁氧酰基碳酸酐(4.06g,24mm0l)。混合物室温搅拌过夜(16h)。反应物浓缩后加入水(70mL)稀释,然后乙酸乙酯萃取(30mLx3),有机层用饱和的碳酸氢钠溶液洗(3OmLx2),水洗(30mL),2N盐酸洗(30mLx2),无水硫酸钠干燥浓缩得到黄色油N-叔丁氧羰基-S-氮杂环丁烷-2-羧酸甲酯3.4g,产率78%,粗产物直接在20%氢氧化钠溶液15mL里加热水解3h,冷却后加入水(20mL)稀释,然后用6N盐酸调节体系pH到3左右,乙酸乙酯萃取(20mLx3),无水硫酸钠干燥浓缩后得无色油状物N-叔丁氧羰基-S-氮杂环丁烷-2-羧酸2.9g,92%。1H-NMR(400MHz,CDCl3):ppm9.37(s,1H),4.73(dd,J=9Hz,1H),3.82-4.15(m,2H),2.02-2.76(m,2H),1.45(s,9H).(C=1 CHC13)。
采用本技术方案的有益效果是:原料易得,每一步都使用常用的廉价工业化试剂,使用硼氢化钠还原较使用四氢铝锂成本降低,且工艺容易操作,与已经发表的文献相比,反应条件温和,不需要特殊处理,操作简单,更适合工业化生产。
以上所述的仅是本发明的优选实施方式,应当指出,对于本领域的普通技术人员来说,在不脱离本发明创造构思的前提下,还可以做出若干变形和改进,这些都属于本发明的保护范围。
Claims (9)
1.一种制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其以N-保护的L-天门冬氨酸为起始原料,其特征在于,包括以下步骤:
上述步骤中,化合物a为N-Cbz-L-天门冬氨酸;化合物b为(R)-2-(3-(N-苄氧羰基)-5-氧代-1,3-氧氮杂环戊烷-4-基)乙酸;化合物c为N-Cbz-天门冬氨酸单甲酯;化合物d为(S)-2-N-Cbz-氨基-4-羟基丁酸甲酯;化合物e为(S)-2-N-Cbz-氨基-4-甲磺酸酯基丁酸甲酯;化合物f为(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸甲酯;化合物g为(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸;
i为多聚甲醛、对甲苯磺酸和溶剂甲苯;ii为甲醇钠的甲醇溶液;iii为分步骤条件,第一步:乙氧酰氯、有机碱和溶剂;第二步:硼氢化钠和四氢呋喃;iv为MsCl、有机碱和溶剂;v为分步骤条件,第一步:氢气,10%的钯碳,以及溶剂甲醇、盐酸或甲磺酸;第二步:碳酸氢钠,甲醇和水,或异丙醇和水;第三步:二叔丁氧酰基碳酸酐,三乙胺,溶剂为甲醇,四氢呋喃,或者二氯甲烷;vi为氢氧化钠或者氢氧化钾,溶剂为甲醇或者水。
2.根据权利要求1所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,由所述化合物a合成到所述化合物b的步骤具体为,以N-苄氧羰基保护的L-天门冬氨酸为原料,以甲苯为溶剂,对甲基苯磺酸催化,通过多聚甲醛关环得到化合物b。
3.根据权利要求1所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,由所述化合物b合成到所述化合物c的步骤具体为,化合物b在甲醇钠的甲醇溶液中生成单酯化产物化合物c。
4.根据权利要求1所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,在由所述化合物c合成到所述化合物d的步骤具体为,化合物c的羧基通过生成酸酐活化,在硼氢化钠作为还原剂的条件下生成醇羟基得到化合物d。
5.根据权利要求4所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,在由所述化合物c合成到所述化合物d的步骤过程中,制备酸酐的酰氯为乙氧酰氯,有机碱为三乙胺,溶剂为二氯甲烷。
6.根据权利要求1到5任一所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,在由所述化合物d合成到所述化合物e的步骤过程中,化合物d的羟基在有机碱的条件下使用MsCl活化得到化合物e,所述有机碱为三乙胺、吡啶、二异丙基乙胺或者N-甲基马菲林,所述溶剂为二氯甲烷、四氢呋喃或吡啶。
7.根据权利要求1所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,在由所述化合物e合成到所述化合物f的步骤过程中,化合物e在10%的钯碳,溶剂为甲醇、盐酸或甲磺酸,以及氢气的条件下脱掉氮保护基,然后在碱性条件下关环,所述碱性条件下关环采用无机碱,所述无机碱为碳酸氢钠,溶剂是甲醇和水,或者异丙醇和水,接着在二叔丁氧酰基碳酸酐、三乙胺,溶剂为甲醇,四氢呋喃,或者二氯甲烷条件下重新上保护得到化合物f,化合物f水解得到(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸。
8.根据权利要求7所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,所述关环的温度在50-80℃。
9.根据权利要求7所述的制备(S)-N-叔丁氧羰基-氮杂环丁烷-2-羧酸的方法,其特征在于,环化后产物的N直接进行保护生成N-保护的氨基酸甲酯即化合物f,化合物f的酯基在碱性条件下水解生成目标产物g,碱为氢氧化钠或氢氧化钾,溶剂为甲醇或者水。
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US6150535A (en) * | 1997-04-24 | 2000-11-21 | Kaneka Corporation | Processes for producing azetidine-2-carboxylic acid and intermediates thereof |
CN1393442A (zh) * | 2001-06-26 | 2003-01-29 | 中国科学院上海药物研究所 | L-n-保护基-氮杂环丁烷-2-羧酸合成方法 |
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2010
- 2010-11-26 CN CN201010561958.XA patent/CN102477007B/zh active Active
Patent Citations (3)
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EP0204440A1 (en) * | 1985-05-09 | 1986-12-10 | Yamanouchi Pharmaceutical Co. Ltd. | Azetidine derivatives production |
US6150535A (en) * | 1997-04-24 | 2000-11-21 | Kaneka Corporation | Processes for producing azetidine-2-carboxylic acid and intermediates thereof |
CN1393442A (zh) * | 2001-06-26 | 2003-01-29 | 中国科学院上海药物研究所 | L-n-保护基-氮杂环丁烷-2-羧酸合成方法 |
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