WO2000076947A1 - Process for the synthesis of 3,5-bis(trifluoromethyl)-bromobenzene - Google Patents
Process for the synthesis of 3,5-bis(trifluoromethyl)-bromobenzene Download PDFInfo
- Publication number
- WO2000076947A1 WO2000076947A1 PCT/US2000/015735 US0015735W WO0076947A1 WO 2000076947 A1 WO2000076947 A1 WO 2000076947A1 US 0015735 W US0015735 W US 0015735W WO 0076947 A1 WO0076947 A1 WO 0076947A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- acid
- bιs
- acetic acid
- sulfuπc
- tπfluoromethyl
- Prior art date
Links
- CSVCVIHEBDJTCJ-UHFFFAOYSA-N FC(c1cc(C(F)(F)F)cc(Br)c1)(F)F Chemical compound FC(c1cc(C(F)(F)F)cc(Br)c1)(F)F CSVCVIHEBDJTCJ-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C17/00—Preparation of halogenated hydrocarbons
- C07C17/093—Preparation of halogenated hydrocarbons by replacement by halogens
- C07C17/10—Preparation of halogenated hydrocarbons by replacement by halogens of hydrogen atoms
- C07C17/12—Preparation of halogenated hydrocarbons by replacement by halogens of hydrogen atoms in the ring of aromatic compounds
Definitions
- the present invention relates to processes for the preparation of 3,5- b ⁇ s(t ⁇ fluoromethyl)bromobenzene (CAS 328-70-1) which is useful as an intermediate in the preparation of certain therapeutic agents
- the present invention provides a process for the preparation of 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene which is an intermediate in the synthesis of pharmaceutical compounds which are substance P (neurok ⁇ n ⁇ n-1) receptor antagonists
- the use of acetic acid and/or a faster rate of stirring for the bromination of l,3-b ⁇ s(t ⁇ fluoromethyl)benzene in sulfu ⁇ c acid results in a more selective bromination of the starting ate ⁇ al with higher yields of the product and lower amounts of bis-brominated byproducts.
- 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene is an important intermediate for a particularly useful class of therapeutic agents
- there is a need for the development of a process for the preparation of 3,5-b ⁇ s- (t ⁇ fluoromethyl)bromobenzene which is readily amenable to scale-up, uses cost- effective and readily available reagents and which is therefore capable of practical application to large scale manufacture.
- the subject invention provides a process for the preparation of 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene via a very simple, short and highly efficient synthesis.
- novel process of this invention involves the synthesis of 3,5- b ⁇ s(t ⁇ fluoromethyl)bromobenzene.
- present invention is concerned with novel processes for the preparation of a compound of the formula:
- This compound is an intermediate in the synthesis of compounds which possess pharmacological activity
- such compounds are substance P (neurok ⁇ n ⁇ n-1) receptor antagonists which are useful e.g., in the treatment of inflammatory diseases, psychiat ⁇ c disorders, and emesis.
- the present invention is directed to processes for the preparation of 3,5-b ⁇ s(trifluoromethyl)bromobenzene of the formula-
- the present invention is directed to the preparation of 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene by the reaction of 1,3-b ⁇ s- (t ⁇ fluoromethyl)benzene with l,3-d ⁇ bromo-5,5-d ⁇ methylhydanto ⁇ n in a mixture composing glacial acetic acid and 96% sulfu ⁇ c acid
- the use of acetic acid and/or a high rate of mixing in this reaction system increases solubilization of the starting mate ⁇ al and results in less sensitivity to stir ⁇ ng parameters, as well as increased regioselectivity with respect to the position of bromination.
- An embodiment of the present invention concerns a process for the preparation of 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene of the formula:
- a preferred embodiment within the present invention concerns a process for the preparation of 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene of the formula
- brominatmg agent selected from N-bromosuccinimide and 1,3- d ⁇ bromo-5,5-d ⁇ methylhydantom, to give 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene
- N-bromosuccinimide ⁇ BS
- DBH l,3-d ⁇ bromo-5,5-d ⁇ methylhydanto ⁇ n
- l,3-d ⁇ bromo-5,5-d ⁇ methylhydantom is more preferred
- the preferred solvent system is a mixture of sulfu ⁇ c acid and acetic acid, and a more preferred solvent system is a mixture of concentrated sulfu ⁇ c acid and glacial acetic acid
- the ratio of sulfu ⁇ c acid acetic acid is approximately 5 1 to 7T (v:v), and it is more preferred that the ratio of sulfu ⁇ c acid'acetic acid is approximately 6:1 (v:v)
- the sulfu ⁇ c acid is added to the acetic acid at a controlled rate with cooling and rapidly mixing (such as with mechanical stir ⁇ ng)
- the ratio of the sulfu ⁇ c acid/ acetic acid to the l,3-b ⁇ s(t ⁇ fluoromethyl)benzene substrate is approximately 2 1 to 1.2 (vv).
- the ratio of the sulfu ⁇ c acid/acetic acid to the l,3-b ⁇ s(t ⁇ fluoromethyl)benzene substrate is approximately 1.5: 1 (v:v).
- the l,3-b ⁇ s(t ⁇ fluoromethyl)- benzene is added to the sulfu ⁇ c ac ⁇ d:acet ⁇ c acid at a controlled rate with cooling and rapidly mixing (such as with mechanical stir ⁇ ng).
- the reaction mixture is rapidly mixed (such as with mechanical stir ⁇ ng) and cooled upon treatment with the brominatmg agent
- the brominatmg agent is added to rapidly mixed reaction mixture which comprises sulfu ⁇ c acid, acetic acid, and l,3-b ⁇ s(t ⁇ fluoromethyl)benzene.
- the brominatmg agent is added to the reaction mixture in a controlled manner as individual portions.
- the preferred temperature range following addition of the brominatmg agent is between about 10 and 70°C, a more prefered reaction temperature range is between about 40 and 50°C, and the most preferred temperature is about 45 ° C
- l,3-b ⁇ s(t ⁇ fluoromethyl)benzene is brommated with N,N'-d ⁇ bromo-5,5-d ⁇ methylhydanto ⁇ n in sulfu ⁇ c acid/acetic acid at 45 °C
- the reaction mixture is then diluted into cold water, and the phases are separated, washed with aqueous sodium hydroxide (preferably 5N sodium hydroxide) and allowed to separate to produce 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene
- the product may contain approximately 2.6% lsome ⁇ c impu ⁇ ties (which typically include l,2-d ⁇ bromo-3,5-b ⁇ s(t ⁇ fluoromethyl)benzene, 1,4-d ⁇ bromo- 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene, as well as small amounts of 2,4-b ⁇ s(t ⁇ fluoro- methyl)bromobenzene, 2,6-b ⁇ s(t ⁇ fluoromethyl)bromobenzene, and 3,5- b ⁇ s(t ⁇ fluoromethyl)b ⁇ phenyl
- the 3,5-b ⁇ s(t ⁇ fluoromethyl)bromobenzene obtained in accordance with the present invention may be used directly without distillation as starting mate ⁇ al in further reactions.
- the rate and selectivity of the bromination is highly dependent on the agitation of the two phase reaction. Slower stirnng increases the amount of bis- brommation and slows the overall rate of reaction.
- the rate of bromination is also dependent on the ratio of acetic to sulfu ⁇ c acid. Progress of the reaction is monitored by GC analysis, as follows Sample- -50 ⁇ l of mixed phase, dilute with cyclohexane (1.5 mL), wash with water (1 mL), then 2N NaOH (1 mL), separate and inject.
- the assay yield of l,3-b ⁇ s(tnfluoromethyl)bromobenzene was 93 7% (137.3 g, 469 mmol), which contained 0.6% l,3-b ⁇ s(t ⁇ fluoromethyl)benzene, 1 0% l,2-d ⁇ bromo-3,5-b ⁇ s(t ⁇ fluoromethyl)benzene, and 0.3% l,4-d ⁇ bromo-3,5-b ⁇ s-
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001512364A JP2003505437A (en) | 1999-06-11 | 2000-06-08 | Synthesis process of 3,5-bis (trifluoromethyl) -bromobenzene |
AU54725/00A AU5472500A (en) | 1999-06-11 | 2000-06-08 | Process for the synthesis of 3,5-bis(trifluoromethyl)-bromobenzene |
EP20000939672 EP1192116A4 (en) | 1999-06-11 | 2000-06-08 | Process for the synthesis of 3,5-bis(trifluoromethyl)-bromobenzene |
CA002374595A CA2374595A1 (en) | 1999-06-11 | 2000-06-08 | Process for the synthesis of 3,5-bis(trifluoromethyl)-bromobenzene |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13888399P | 1999-06-11 | 1999-06-11 | |
US33068499A | 1999-06-11 | 1999-06-11 | |
US09/330,684 | 1999-06-11 | ||
US60/138,883 | 1999-06-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000076947A1 true WO2000076947A1 (en) | 2000-12-21 |
Family
ID=26836648
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2000/015735 WO2000076947A1 (en) | 1999-06-11 | 2000-06-08 | Process for the synthesis of 3,5-bis(trifluoromethyl)-bromobenzene |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1192116A4 (en) |
JP (1) | JP2003505437A (en) |
AU (1) | AU5472500A (en) |
CA (1) | CA2374595A1 (en) |
WO (1) | WO2000076947A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002024615A1 (en) * | 2000-09-23 | 2002-03-28 | Synprotec Limited | 1,3-bis(trifluoromethyl)benzene derivatives |
US6814895B2 (en) | 2000-12-20 | 2004-11-09 | Merck & Co., Inc. | Process for the synthesis of 1-(3,5-bis(trifluoromethyl)phenyl)ethan-1-one |
CN110498729A (en) * | 2019-09-09 | 2019-11-26 | 武汉诺安药业有限公司 | A kind of clean method for preparing of hydrochloric acid Amorolfine intermediate |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4569002B2 (en) * | 2000-12-27 | 2010-10-27 | 住友化学株式会社 | Process for producing bromoaromatic condensed ring compound |
CN1300076C (en) * | 2005-08-05 | 2007-02-14 | 上海康鹏化学有限公司 | Preparation method of double(2-hydroxyl hexafluopropyl) phenol |
ITMI20060489A1 (en) * | 2006-03-17 | 2007-09-18 | Miteni Spa | PROCEDURE FOR THE PREPARATION OF 1-BEONO-3-TRIFLUOROMETOSSIBENZENE |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5502261A (en) * | 1994-03-23 | 1996-03-26 | Hoechst Aktiengesellschaft | Process for preparing 2,2'-bis(halomethyl)-1,1'-binaphthyl |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3806962B2 (en) * | 1995-12-22 | 2006-08-09 | 日産化学工業株式会社 | Method for producing 3,5-bis (trifluoromethyl) bromobenzene |
GB0023383D0 (en) * | 2000-09-23 | 2000-11-08 | Synprotec Ltd | 3,5-Bis (Trifluormethyl)Benzene derivatives |
-
2000
- 2000-06-08 CA CA002374595A patent/CA2374595A1/en not_active Abandoned
- 2000-06-08 EP EP20000939672 patent/EP1192116A4/en not_active Withdrawn
- 2000-06-08 AU AU54725/00A patent/AU5472500A/en not_active Abandoned
- 2000-06-08 WO PCT/US2000/015735 patent/WO2000076947A1/en not_active Application Discontinuation
- 2000-06-08 JP JP2001512364A patent/JP2003505437A/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5502261A (en) * | 1994-03-23 | 1996-03-26 | Hoechst Aktiengesellschaft | Process for preparing 2,2'-bis(halomethyl)-1,1'-binaphthyl |
Non-Patent Citations (1)
Title |
---|
See also references of EP1192116A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002024615A1 (en) * | 2000-09-23 | 2002-03-28 | Synprotec Limited | 1,3-bis(trifluoromethyl)benzene derivatives |
US6814895B2 (en) | 2000-12-20 | 2004-11-09 | Merck & Co., Inc. | Process for the synthesis of 1-(3,5-bis(trifluoromethyl)phenyl)ethan-1-one |
CN110498729A (en) * | 2019-09-09 | 2019-11-26 | 武汉诺安药业有限公司 | A kind of clean method for preparing of hydrochloric acid Amorolfine intermediate |
Also Published As
Publication number | Publication date |
---|---|
AU5472500A (en) | 2001-01-02 |
EP1192116A4 (en) | 2002-10-24 |
CA2374595A1 (en) | 2000-12-21 |
EP1192116A1 (en) | 2002-04-03 |
JP2003505437A (en) | 2003-02-12 |
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