CN1052226C - 2-氨基-4,6-二氯嘧啶的制备方法 - Google Patents
2-氨基-4,6-二氯嘧啶的制备方法 Download PDFInfo
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- CN1052226C CN1052226C CN95105375A CN95105375A CN1052226C CN 1052226 C CN1052226 C CN 1052226C CN 95105375 A CN95105375 A CN 95105375A CN 95105375 A CN95105375 A CN 95105375A CN 1052226 C CN1052226 C CN 1052226C
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- pyrimidine
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
- C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
- C07D239/24—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members
- C07D239/28—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having three or more double bonds between ring members or between ring members and non-ring members with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, directly attached to ring carbon atoms
- C07D239/32—One oxygen, sulfur or nitrogen atom
- C07D239/42—One nitrogen atom
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- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Saccharide Compounds (AREA)
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Plural Heterocyclic Compounds (AREA)
Abstract
通过让2-氨基-4,6-二羟基嘧啶与过量的三氯氧化磷在温度20-80℃下和在作为酸捕捉剂的三乙胺存在下进行反应来制备2-氨基-4,6-二氯嘧啶的方法。
Description
2-氨基-4,6-二氯嘧啶(ADCP)是生产药物和农用化学品的已知重要中间体。
一些制备ADCP的方法已经在文献中有报导。如,一个制备方法例如在专利US3,991,190的实施例1中是这样叙述的,其中2-氨基-4,6-二羟基嘧啶(ADHP)与过量的三氯氧化磷(POCl3)及二甲基苯胺反应,二甲基苯胺作为酸捕捉剂,同时在温度约为107℃时煮沸回流而得到ADCP。当过量的三氯氧化磷被蒸出后,通过在水中悬浮并加入氢氧化钠溶液直到pH达到8至9,使ADCP在此过程中析出,然而在这个方法中形成大量的副产物,ADCP的产率较低(70%)。做为改进这种方法的建议,专利US4,929,729描述了ADHP与三氯氧化磷在50-100℃的温度下,以及在另外的溶剂中存在酸捕捉剂的情况下反应。ADCP的收率比US3,991,190中的高出约10%(82-85%),纯度约为91~95%。然而,这种方法的一个缺点是需要另外的溶剂。另一个缺点是象US4,929,729的实施例中所做的,为了分离出ADCP,反应混合物必须倒入冰水中,氯化完成后过量的三氯氧化磷和溶剂必须被分离出,然后还需要再加热到50℃,这样做需要消耗另外的能量。
本发明的目的在于发现一种制备2-氨基-4,6-二氯嘧啶的方法,这种方法不需要另外的溶剂,得到ADCP收率和纯度都比前面文献报导的高,避免了副产物的形成,也防止了在ADCP分离过程中消耗额外的能量。
出乎意料地,按本发明方法,可以达到这种目的。
因此,本发明涉及一种制备2-氨基-4,6-二氯嘧啶的方法。其特征在于2-氨基-4,6-二羟基嘧啶与过量的三氯氧化磷反应,温度在20至80℃,并且有三乙胺存在做为酸捕捉剂,然后分离出2-氨基-4,6-二氯嘧啶。
在根据本发明的方法中,2-氨基-4,6-二羟基嘧啶(ADHP)与过量的POCl3反应,得到2-氨基-4,6-二氯嘧啶(AD-CP)。
为此目的,ADHP悬浮在POCl3中,它即可以做为反应物,也做为反应介质,这意味着不需要外加溶剂或稀释剂。保持悬浮的难易由所采用的POCl3的量决定。这里ADHP与POCl3的摩尔比是可变的,下限受悬浮液的搅拌度影响,上限则主要由经济方面的因素影响。
优选采用ADHP与POCl3的摩尔比为1∶3到1∶8,特别是1∶4到1∶6。大量过量的POCl3对反应本身没有什么不良的作用,而且如果需要的话也可以采用,但是出于经济方面的考虑是不适宜的。
如此所得到的悬浮液被加热到20~80℃。待加热悬浮液的粘度越大,加热的温度应越高,以便得到充分的搅拌,并由此使悬浮液彻底混合。悬浮液优选被加热至40~80℃,最好至70℃到75℃。
然后在大约20到80分钟之间,最好应在30到60分钟之间计量地将当量三乙胺加入混合物中。然而也可使用略微过量的三乙胺,使得ADHP与三乙胺的摩尔比大约为1∶2到1∶3,最好在1∶2.25。
当计量加入三乙胺结束后,在反应温度下搅拌应再持续2-10分钟,最好是4-6分钟。为了分离出ADCP,用减压蒸馏的方法将过量的三氯氧化磷蒸出。塔底温度可根据所达到的真空度而变化,下限受反应混合物搅拌度的影响,上限约80℃。塔底温度最好保持在70℃至75℃。在大约40-60℃的温度下,将残留物放在水中搅拌。如此得到的悬浮液,在40-60℃下,继续搅拌1.5至2.5小时,然后加入浓度为20%至50%,最好是浓度为20%的NaOH溶液,直到pH达到大约2.5-4,最好约为3。
最后,沉淀下来的产物被过滤出来,用水洗涤,在空气中干燥。按本发明的方法所得到的ADCP,其收率高于90%和纯度(约99%)都比前面文献的高。
实施例1
100ml(1.12摩尔)的三氯氧化磷和25.4g(0.2摩尔)的2-氨基-4,6-二羟基嘧啶被依次加入250ml双壁玻璃反应器内,这个反应器带有搅拌器、回流冷凝器和恒温加热器。所得到的悬浮液加热到75℃,然后将46g(0.45摩尔)的三乙胺在1小时内计量加入。当计量加入完成后,将混合物在75℃下再搅拌5分钟,加入过量的三氯氧化磷,然后减压蒸馏,塔底温度保持在大约75℃。残留物在200ml水中于大约50℃的温度下搅拌,如此所得的悬浮液在50℃下继续搅拌2小时。然后把浓度为20%的NaOH溶液加入悬浮液中,直至达到pH值为3。
沉淀出来的产物被过滤出来,用水洗涤,在空气中干燥。
收率30.2克(92.1%)
GC测得的含量:99%。
Claims (4)
1.制备2-氨基-4,6-二氯嘧啶的方法,其特征在于2-氨基-4,6-二羟基嘧啶与过量的三氯氧化磷在温度20-80℃下、在作为酸捕捉剂的三乙胺存在下进行反应,然后将2-氨基-4,6-二氯嘧啶分离出来。
2.根据权利要求1的方法,其特征在于2-氨基-4,6-二羟基嘧啶与三氯氧化磷的摩尔比采用1∶3至1∶8。
3.根据权利要求1的方法,其特征在于所采用的三乙胺与2氨基-4,6-二羟基嘧啶的摩尔比为2∶1至3∶1。
4.根据权利要求1的方法,其中将2-氨基-4,6-二氯嘧啶分离出来的方法是,将过量的三氯氧化磷在减压下蒸出,将残留物于40~60℃温度下悬浮在水中,经过搅拌1.5至2.5小时后加入浓度为20%至50%的NaOH溶液,直至pH达到大约2.5至4,然后将沉淀下来的2-氨基-4,6-二氯嘧啶过滤出来,用水洗涤并在空气中干燥。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT995A/1994 | 1994-05-13 | ||
AT995A/94 | 1994-05-13 | ||
AT0099594A AT402924B (de) | 1994-05-13 | 1994-05-13 | Verfahren zur herstellung von 2-amino-4,6-dichloro-pyrimidin |
Publications (2)
Publication Number | Publication Date |
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CN1126205A CN1126205A (zh) | 1996-07-10 |
CN1052226C true CN1052226C (zh) | 2000-05-10 |
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Application Number | Title | Priority Date | Filing Date |
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CN95105375A Expired - Fee Related CN1052226C (zh) | 1994-05-13 | 1995-05-11 | 2-氨基-4,6-二氯嘧啶的制备方法 |
Country Status (23)
Country | Link |
---|---|
US (1) | US5563270A (zh) |
EP (1) | EP0682018B1 (zh) |
JP (1) | JPH0841034A (zh) |
KR (1) | KR950032139A (zh) |
CN (1) | CN1052226C (zh) |
AT (2) | AT402924B (zh) |
AU (1) | AU682261B2 (zh) |
CA (1) | CA2149273A1 (zh) |
CZ (1) | CZ287703B6 (zh) |
DE (1) | DE59502219D1 (zh) |
DK (1) | DK0682018T3 (zh) |
ES (1) | ES2116007T3 (zh) |
FI (1) | FI952287A (zh) |
HR (1) | HRP950262B1 (zh) |
HU (1) | HU217649B (zh) |
IL (1) | IL113712A (zh) |
NO (1) | NO304309B1 (zh) |
NZ (1) | NZ272110A (zh) |
PL (1) | PL180989B1 (zh) |
SK (1) | SK282077B6 (zh) |
TW (1) | TW422839B (zh) |
YU (1) | YU26995A (zh) |
ZA (1) | ZA953886B (zh) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101363542B (zh) * | 2008-09-09 | 2012-07-25 | 王春阳 | 电动控制离合换档装置 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT402818B (de) * | 1995-06-02 | 1997-09-25 | Chemie Linz Gmbh | Verfahren zur herstellung von reinem 4,6-dichlorpyrimidin |
EP1042303B1 (en) * | 1997-12-19 | 2003-02-05 | Dow AgroSciences LLC | Chloropyrimidine process |
DK1013647T3 (da) * | 1998-12-21 | 2003-03-10 | Lonza Ag | Fremgangsmåde til fremstilling af N-(amino-4,6-dihalogenpyrimidin)-formamider |
CN102702110A (zh) * | 2012-05-24 | 2012-10-03 | 盛世泰科生物医药技术(苏州)有限公司 | 一种4-氨基-5,6-二氯嘧啶的制备方法 |
CN109796413A (zh) * | 2019-01-24 | 2019-05-24 | 安徽广信农化股份有限公司 | 一种用于4,6-二氯嘧啶合成的三乙胺回收工艺 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3991190A (en) * | 1974-05-02 | 1976-11-09 | Istituto Chemioterapico Italiano S.P.A. | Treatment of viral infections |
US4929729A (en) * | 1988-02-19 | 1990-05-29 | Ishihara Sangyo Kaisha Ltd. | Process for producing 2-amino-4,6-dichloropyrimidine |
WO1995007265A1 (en) * | 1993-09-10 | 1995-03-16 | E.I. Du Pont De Nemours And Company | Improved process for preparing 2-amino-4,6-dichloropyrimidine |
-
1994
- 1994-05-13 AT AT0099594A patent/AT402924B/de not_active IP Right Cessation
-
1995
- 1995-04-26 ES ES95106196T patent/ES2116007T3/es not_active Expired - Lifetime
- 1995-04-26 AT AT95106196T patent/ATE166349T1/de not_active IP Right Cessation
- 1995-04-26 EP EP95106196A patent/EP0682018B1/de not_active Expired - Lifetime
- 1995-04-26 DE DE59502219T patent/DE59502219D1/de not_active Expired - Fee Related
- 1995-04-26 DK DK95106196T patent/DK0682018T3/da active
- 1995-04-28 YU YU26995A patent/YU26995A/sh unknown
- 1995-04-28 HR HRA995/94A patent/HRP950262B1/xx not_active IP Right Cessation
- 1995-05-10 TW TW084104635A patent/TW422839B/zh not_active IP Right Cessation
- 1995-05-11 CN CN95105375A patent/CN1052226C/zh not_active Expired - Fee Related
- 1995-05-11 FI FI952287A patent/FI952287A/fi unknown
- 1995-05-11 JP JP7113351A patent/JPH0841034A/ja not_active Ceased
- 1995-05-12 SK SK621-95A patent/SK282077B6/sk unknown
- 1995-05-12 NO NO951889A patent/NO304309B1/no not_active IP Right Cessation
- 1995-05-12 HU HU9501404A patent/HU217649B/hu not_active IP Right Cessation
- 1995-05-12 PL PL95308578A patent/PL180989B1/pl unknown
- 1995-05-12 ZA ZA953886A patent/ZA953886B/xx unknown
- 1995-05-12 AU AU20033/95A patent/AU682261B2/en not_active Ceased
- 1995-05-12 US US08/440,257 patent/US5563270A/en not_active Expired - Fee Related
- 1995-05-12 CA CA002149273A patent/CA2149273A1/en not_active Abandoned
- 1995-05-12 IL IL11371295A patent/IL113712A/xx not_active IP Right Cessation
- 1995-05-12 KR KR1019950011647A patent/KR950032139A/ko active IP Right Grant
- 1995-05-12 CZ CZ19951234A patent/CZ287703B6/cs not_active IP Right Cessation
- 1995-05-12 NZ NZ272110A patent/NZ272110A/en unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3991190A (en) * | 1974-05-02 | 1976-11-09 | Istituto Chemioterapico Italiano S.P.A. | Treatment of viral infections |
US4929729A (en) * | 1988-02-19 | 1990-05-29 | Ishihara Sangyo Kaisha Ltd. | Process for producing 2-amino-4,6-dichloropyrimidine |
WO1995007265A1 (en) * | 1993-09-10 | 1995-03-16 | E.I. Du Pont De Nemours And Company | Improved process for preparing 2-amino-4,6-dichloropyrimidine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101363542B (zh) * | 2008-09-09 | 2012-07-25 | 王春阳 | 电动控制离合换档装置 |
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