CN1248242A - 4-氰基-4'-羟基联苯的制备方法 - Google Patents
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C255/00—Carboxylic acid nitriles
- C07C255/49—Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton
- C07C255/53—Carboxylic acid nitriles having cyano groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing cyano groups and hydroxy groups bound to the carbon skeleton
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C253/00—Preparation of carboxylic acid nitriles
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
本发明涉及4-氰基-4’-羟基联苯的制备方法,该方法包括:4-溴苯甲醛中醛官能团的保护,被保护的4-溴苯甲醛与对-烷氧基苯基卤化镁的反应,被保护的4-烷氧基-4’-甲酰基—联苯中甲酰基的去保护和甲酰基向氰基的转化,以及所得到的4-烷氧基-4’-氰基联苯中烷氧基的水解。
Description
本发明涉及4-氰基-4’-羟基联苯的制备方法。这一化合物已知为中间体并用于例如液晶聚合物的单体的合成(GB2002767)(J.Polym.Sci.,Part C:Polymer Letters,28卷,345-355(1990);J.Mater,Chem.,1993年,3(6),633-642)或用于形成特定的聚硅氧烷(US526052)。
4-氰基-4’-羟基联苯可按照专利申请EP 44759或J.Mater.Chem.,1933,3(6),633-642中所描述的方法,通过让4-溴-4’-羟基联苯与氰化铜反应来制备。另一种制备方法描述在专利US526052中,该方法包括在Ni(PPh3)4存在下由二(4-甲氧基苯基)锌与4-溴苯甲腈反应。这些方法的缺点是它们使用毒性试剂如氰化铜。本发明的主题是不使用毒性试剂如氰化铜或使用比现有技术所描述种类毒性较低的试剂的制备方法。
本发明涉及4-氰基-4’-羟基联苯的制备方法,该方法包括:
-4-溴苯甲醛中醛官能团的保护,
-被保护的4-溴苯甲醛与对-烷氧基苯基卤化镁的反应,
-被保护的4-烷氧基-4’-甲酰基-联苯中甲酰基的去保护和甲酰基向氰基的转化,和
-所得到的4-烷氧基-4’-氰基联苯中烷氧基的水解。
该反应优选在惰性气氛中进行。例如,该反应在氮气气氛中进行。
醛官能团能够由本领域专业人员公知的标准方法来保护。因此,该保护例如可通过使用乙二醇,丙二醇或二甲醚作为试剂来进行。
被保护的4-溴苯甲醛能够与格利雅试剂在非质子传递溶剂中进行反应。对-烷氧基苯基卤化镁的烷氧基优选是具有至多5个碳原子的烷氧基;该烷氧基能够是,例如,甲氧基或乙氧基,优选是甲氧基,所使用的卤素优选是氯或溴。
去保护反应的性质取决于用于保护反应的试剂。去保护可以是水解反应。甲酰基向氰基的转化能够由本领域专业人员公知的标准方法来进行。羟基胺能够用作试剂。
烷氧基的水解能够在没有氰基水解的情况下通过使用合适试剂如氯化吡啶鎓来进行。
下面的实施例用于说明上述操作程序,决不应被视为限定本发明的范围。
实施例1
2-(4-溴苯基)-1,3-二氧戊环的制备
在氮气气氛下将40g(216mmol)的溴代苯甲醛,39ml(700mmol)乙二醇,1.6g(9.3mmol)的对-甲苯磺酸和670ml甲苯加入到装有迪安-斯达克装置的2升三颈烧瓶中。反应混合物升温回流,同时除去所形成的水。在回流24小时后,反应混合物用饱和的碳酸钠水溶液(240ml)进行水解。回收有机相和用饱和氯化钠溶液洗涤两次(2×160ml),然后在真空下浓缩。所获得的粗产物在40mm/Hg(150-156℃)下进行蒸馏。
实施例2
2-[对-(4-甲氧基苯基)-苯基]-1,3-二氧戊环的制备
在氮气气氛下将0.8g镁,1ml四氢呋喃(THF)和一晶粒碘加入到50ml三颈烧瓶中。反应混合物被加热至40℃,将4.75g 4-溴茴香醚在25ml THF中的溶液倾入。反应混合物加热回流1.5小时。
在恢复到室温后,在保持温度于0℃的同时,在催化剂(Pd,0.25%)存在下将该溶液倾入到2-(4-溴苯基)-1,3-二氧戊环(5g)在50mlTHF中的混合物中。反应混合物回到室温,添加第二份催化剂(0.25%)。反应混合物然后在40℃下加热2小时。在用40ml水进行水解后,回收的水相用甲苯萃取(2×30ml)。合并有机相并加以浓缩,以获得所需产物。
实施例3
对-(4-甲氧基苯基)苯甲腈的制备
在氮气气氛下将2.6g的2-[对-(4-甲氧基苯基)-苯基]-1,3-二氧戊环,0.917g的羟基胺盐酸盐,40ml 1.8M盐酸乙醇溶液和10ml乙醇加入到100ml三颈烧瓶中。反应混合物加热回流4小时,然后在真空下浓缩。残余物被溶于30ml水中,然后添加220ml的甲基叔丁基醚(MTBE)。分离有机相,水相用MTBE萃取(2×20ml)。合并有机相,用饱和氯化钠溶液洗涤,用无水硫酸镁干燥和在真空下浓缩(产率:75%)。
实施例4
4-氰基-4’-羟基联苯的制备
在氮气气氛下将1g对-(4-甲氧基苯基)苯甲腈和3g氯化吡啶鎓加到50ml三颈烧瓶中。混合物在200℃下加热6小时,随后让其冷却。在110℃下将5ml吡啶和5ml 1N盐酸倾入其中。反应混合物在室温下用氯仿萃取。收集有机相,用水洗涤(2×30ml),用无水硫酸镁干燥和真空浓缩。在从乙酸乙酯/庚烷混合物中重结晶之后,获得所需产物(产率50%)。
Claims (6)
1、4-氰基-4’-羟基联苯的制备方法,该方法包括:
-4-溴苯甲醛中醛官能团的保护,
-被保护的4-溴苯甲醛与对-烷氧基苯基卤化镁的反应,
-被保护的4-烷氧基-4’-甲酰基-联苯中甲酰基的去保护和甲酰基向氰基的转化,和
-所形成的4-烷氧基-4’-氰基联苯中烷氧基的水解。
2、根据权利要求1的方法,其中保护反应是通过使用乙二醇,丙二醇或二甲醚作为试剂来进行的。
3、根据权利要求1或2的方法,其中被保护的4-溴苯甲醛与格利雅试剂的反应是在非质子传递溶剂中进行的。
4、根据权利要求1-3中任一项的方法,其中对-烷氧基苯基卤化镁的烷氧基优选是具有至多5个碳原子的烷氧基;所使用的卤素优选是氯或溴。
5、根据权利要求1-4中任一项的方法,其中去保护反应是水解。
6、根据权利要求1-5中任一项的方法,其中烷氧基的水解是借助氯化吡啶鎓进行的。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR97/01861 | 1997-02-18 | ||
FR9701861A FR2759696B1 (fr) | 1997-02-18 | 1997-02-18 | Preparation du 4-cyano-4'-hydroxy biphenyle |
Publications (1)
Publication Number | Publication Date |
---|---|
CN1248242A true CN1248242A (zh) | 2000-03-22 |
Family
ID=9503837
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN98802662A Pending CN1248242A (zh) | 1997-02-18 | 1998-02-16 | 4-氰基-4'-羟基联苯的制备方法 |
Country Status (11)
Country | Link |
---|---|
US (1) | US6046352A (zh) |
EP (1) | EP0966432A1 (zh) |
JP (1) | JP2001511816A (zh) |
KR (1) | KR20000071137A (zh) |
CN (1) | CN1248242A (zh) |
AU (1) | AU6404498A (zh) |
CA (1) | CA2280955A1 (zh) |
FR (1) | FR2759696B1 (zh) |
NO (1) | NO993952L (zh) |
NZ (1) | NZ337648A (zh) |
WO (1) | WO1998037059A1 (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102516163A (zh) * | 2011-12-02 | 2012-06-27 | 江苏德威新材料股份有限公司 | 一种液晶功能化的吡啶化合物的制备和应用 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102676177A (zh) * | 2012-04-24 | 2012-09-19 | 杭州泽泉生物科技有限公司 | 一种联苯腈型液晶材料的生产工艺 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2400528A1 (fr) * | 1977-08-19 | 1979-03-16 | Thomson Csf | Substance organique polymerisable en phase mesomorphe, procede de fabrication et dispositif comportant une couche mince de ladite substance |
GB1596014A (en) * | 1977-08-24 | 1981-08-19 | Secr Defence | Optically active liquid crystal materials and liquid crystal devices containing them |
FR2486955A1 (fr) * | 1980-07-18 | 1982-01-22 | Thomson Csf | Cristal liquide smectique de type a presentant une anisotropie dielectrique positive |
JPS5746952A (en) * | 1980-09-04 | 1982-03-17 | Chisso Corp | 4'-(beta-alkyloxyethoxy)-4-cyanobiphenyl |
US5262052A (en) * | 1992-03-09 | 1993-11-16 | Brigham Young University | Polysiloxanes containing pendant cyano substituted biphenyls as stationary phases for chromatographic columns |
-
1997
- 1997-02-18 FR FR9701861A patent/FR2759696B1/fr not_active Expired - Fee Related
-
1998
- 1998-02-16 WO PCT/FR1998/000289 patent/WO1998037059A1/fr not_active Application Discontinuation
- 1998-02-16 AU AU64044/98A patent/AU6404498A/en not_active Abandoned
- 1998-02-16 CN CN98802662A patent/CN1248242A/zh active Pending
- 1998-02-16 JP JP53631398A patent/JP2001511816A/ja active Pending
- 1998-02-16 CA CA002280955A patent/CA2280955A1/fr not_active Abandoned
- 1998-02-16 US US09/355,909 patent/US6046352A/en not_active Expired - Fee Related
- 1998-02-16 EP EP98909541A patent/EP0966432A1/fr not_active Withdrawn
- 1998-02-16 KR KR1019997007426A patent/KR20000071137A/ko not_active Application Discontinuation
- 1998-02-16 NZ NZ337648A patent/NZ337648A/xx unknown
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1999
- 1999-08-17 NO NO993952A patent/NO993952L/no not_active Application Discontinuation
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102516163A (zh) * | 2011-12-02 | 2012-06-27 | 江苏德威新材料股份有限公司 | 一种液晶功能化的吡啶化合物的制备和应用 |
CN102516163B (zh) * | 2011-12-02 | 2013-09-25 | 江苏德威新材料股份有限公司 | 一种液晶功能化的吡啶化合物的制备和应用 |
Also Published As
Publication number | Publication date |
---|---|
WO1998037059A1 (fr) | 1998-08-27 |
NZ337648A (en) | 2000-01-28 |
FR2759696A1 (fr) | 1998-08-21 |
AU6404498A (en) | 1998-09-09 |
JP2001511816A (ja) | 2001-08-14 |
US6046352A (en) | 2000-04-04 |
NO993952D0 (no) | 1999-08-17 |
KR20000071137A (ko) | 2000-11-25 |
CA2280955A1 (fr) | 1998-08-27 |
FR2759696B1 (fr) | 1999-04-16 |
NO993952L (no) | 1999-08-17 |
EP0966432A1 (fr) | 1999-12-29 |
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