EP3844153A1 - Procede de preparation de nitropyrazoles - Google Patents
Procede de preparation de nitropyrazolesInfo
- Publication number
- EP3844153A1 EP3844153A1 EP19774159.8A EP19774159A EP3844153A1 EP 3844153 A1 EP3844153 A1 EP 3844153A1 EP 19774159 A EP19774159 A EP 19774159A EP 3844153 A1 EP3844153 A1 EP 3844153A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- formula
- compound
- solvent
- approximately
- heat treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D231/00—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings
- C07D231/02—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings
- C07D231/10—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three double bonds between ring members or between ring members and non-ring members
- C07D231/14—Heterocyclic compounds containing 1,2-diazole or hydrogenated 1,2-diazole rings not condensed with other rings having two or three 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, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D231/16—Halogen atoms or nitro radicals
Definitions
- the invention relates to the field of energy molecules capable of being used in the manufacture of pyrotechnic charges. More particularly, the invention relates to a process for the preparation of 3,4,5-trinitropyrazole precursors.
- the energetic molecules such as 3,4,5-trinitropyrazole (hereinafter, “3,4,5-TNP”) or the derivatives of this compound (such as those described in EP-A-2 130 821) are suitable for the manufacture of pyrotechnic charges because of their advantageous properties in terms of performance and sensitivity, while retaining a high level of thermal stability, compatible with their use in the fields of propulsion and explosives.
- a synthesis route for 3,4,5-TNP, from 3,5-din ⁇ tropyrazole, is described in application FR-A-2 917 409.
- 3,5-dinitropyrazole is obtained by sigmatropic rearrangement of 1,3 -dinitropyrazole, itself obtained from 3-nitropyrazole, which is obtained by sigmatropic rearrangement of N-nitropyrazole.
- Operating conditions for the sigmatropic rearrangement of N-nitropyrazole are described for example in J. Org. Chem. 1973, 38 (10), 1777-1782. These operating conditions (6 hours at 160 ° C.) are considered to be limiting in order to envisage development on an industrial scale. This results in poor efficiency and yield of the reaction for obtaining 3,4,5-TNP from N-nitropyrazole.
- the invention relates to a process for the preparation of a compound of formula (VIIa):
- R 3 is an N0 2 group and R is either hydrogen or an N0 2 group.
- the sigmatropic rearrangement step of the compound of formula (Vllb) is advantageously carried out in a solvent which can be used to carry out in situ a step of subsequent nitration of the compound of formula (Vlla), ie a solvent which is an NO 2 + cation promoter.
- the compound of formula (Vllb) is dissolved in a benzene solvent, such as xylene, bromobenzene or dichlorobenzene, or in an "acetic" solvent such as acetic acid or acetic anhydride, the latter two being preferred because of their capacity to be promoters of NO 2 + cation.
- concentration of the compound of formula (Vllb) is advantageously from about 50 to about 500 g / L.
- the duration of the heat treatment is from approximately 1 min to approximately 1 h, preferably from approximately 1 min to approximately 45 min, preferably from approximately 1 min to approximately 30 min, preferably from about 1 min to about 15 min, preferably from about 1 min to about 10 min.
- the heat treatment of the compound of formula (VIIb) is such that the temperature of the reaction medium is approximately 150 ° C. at about 220 ° C, preferably about 150 ° C to about 200 ° C, more preferably from about 180 ° C to about 200 ° C.
- the expected product of formula (VIIa) precipitates when cold and is then recovered according to techniques well known to those skilled in the art; if no precipitation is observed cold, the addition of water makes it possible to precipitate the product. In either case the yield of compound of formula (VIIa) is from about 60% to about 100%.
- the invention relates to a process for the preparation of the compound of formula (II):
- each of the compounds of formula (VI) and of formula (IV) is carried out in a manner known to those skilled in the art, typically by placing the compound in question in the presence of nitric acid and optionally d water, in a suitable solvent.
- a benzene solvent such as xylene, bromobenzene or dichlorobenzene, or an "acetic" solvent such as acetic acid or acetic anhydride, can be used as solvent, acetic acid being preferred.
- the duration of the heat treatment of each of the compounds of formula (V) and of formula (III) is from approximately 1 min to approximately 1 h, preferably from approximately 1 min to about 45 min, preferably from about 1 min to about 30 min, preferably from about 1 min to about 15 min, preferably from about 1 min to about 10 min.
- the heat treatment of the compounds of formula (V) and (III) is such that the temperature of the reaction medium is from approximately 150 ° C. to approximately 220 ° C., preferably d about 150 ° C to about 200 ° C, more preferably about 180 ° C to about 200 ° C.
- each of steps a) to d) is carried out in the presence of the same solvent, advantageously chosen from a benzene solvent, such as xylene, dichlorobenzene or bromobenzene; acetic acid; or acetic anhydride.
- the solvent used in each of steps a) to d) is a solvent which makes it possible to carry out in situ a step of subsequent nitration of the compound of formula (IV) and / or of the compound of formula (II), the acid acetic acid or acetic anhydride being particularly suitable for this purpose.
- Such an embodiment makes it possible to envisage a synthesis of the compound of formula (II) continuously, and to reduce the amount of solvent to be reprocessed / eliminated.
- the invention relates to a process for the preparation of 3,4,5-trinitropyrazole which comprises the nitration of the compound of formula (II).
- This nitration is carried out according to techniques known to those skilled in the art, for example by reaction of the compound of formula (II) with nitric acid in the presence of sulfuric acid.
- N-nitropyrazole 210 mg were introduced into a reaction tube with 4 ml of bromobenzene. After sealing the tube, the latter was heated in a microwave reactor to 200 ° C (power: 150 W) for 5 minutes, the pressure inside the tube was stable around 2 bar. After cooling, the product which precipitated was filtered and dried under vacuum. 210 mg of product were thus obtained which, after NMR analysis, corresponds to 3-nitropyrazole (100% yield).
- DSC 8 ° C / tnin
- Mp 175.6 ° C
- vaporization 250 ° C
- N-nitropyrazole 210 mg were introduced into a reaction tube with 4 ml of acetic acid. After sealing the tube, the latter was heated in a microwave reactor to 200 ° C (power: 150 W) for 5 minutes, the pressure inside the tube was stable around 3 bars. After cooling, the product which precipitated was filtered and dried under vacuum. 200 mg of product were thus obtained which, after NMR analysis, corresponds to 3-nitropyrazole (95% yield).
- the yield of the sigmatropic rearrangement reaction of 1,3-dinitropyrazole, carried out by conventional heating is approximately 40%.
- an assembly represented in FIG. 1, was used, consisting of a container containing the reaction medium A (typically, N-nitropyrazole or 1,3-dinitropyrazole), of an HPLC pump. , an 80 mL microwave reactor (milli-jet type), a pressure regulating valve to maintain the assembly at 3 bars, and a recovery flask B.
- the microwave reactor is a tube in thick glass surmounted by an introduction head and fitted with a magnetic bar. The introduction head receives the input and output connections from the reactor.
- the inlet connection is plunging, that is to say that the reagent is introduced at the bottom of the tube then by the pushing effect of the pump the product exits from the top of the tube via the outlet connection towards the spillway set to a pressure of 3 bars.
- the recovery bottle it is a glass bottle or bottle, or even a condenser followed by a wringer in order to continuously separate the solvent from the final product.
- the assembly was operated with pure bromobenzene in order to increase the temperature up to 200 ° C with a power of 300W and a flow rate of 10 mL / min. Once the temperature and pressure had been set up, the reactor was supplied with an N-nitropyrazole solution at 50 g / L. The product which precipitated was recovered after return to atmospheric pressure of the assembly and reduction of the temperature. NMR analysis confirmed that the product obtained corresponds to 3-nitropyrazole (80% yield). The assembly operated for one hour without interruption with a production of 30 g.
- the assembly was put into operation with pure acetic anhydride in order to increase the temperature with a power of 300W and a flow rate of 10 mL / min. Once the temperature and pressure had been set up, the reactor was supplied with an N-nitropyrazole solution at 50 g / L. The product which precipitated after addition of water was recovered after return to atmospheric pressure of the assembly and reduction of the temperature. NMR analysis confirmed that the product obtained corresponds to 3-nitropyrazole (yield of 60%). The assembly operated for one hour without interruption with a production of 30 g.
- the reactor was supplied with an N-nitropyrazole solution at approximately 50 g / L.
- the product which precipitated was recovered after return to atmospheric pressure of the assembly and reduction of the temperature.
- NMR analysis confirmed that the product obtained corresponds to 3-nitropyrazole (yield of 60%).
- the assembly operated for one hour without interruption with a production of 30 g.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Plural Heterocyclic Compounds (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1800916A FR3085377B1 (fr) | 2018-08-31 | 2018-08-31 | Procede de preparation de nitropyrazoles |
PCT/FR2019/052007 WO2020043998A1 (fr) | 2018-08-31 | 2019-08-30 | Procede de preparation de nitropyrazoles |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3844153A1 true EP3844153A1 (fr) | 2021-07-07 |
Family
ID=65685377
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19774159.8A Pending EP3844153A1 (fr) | 2018-08-31 | 2019-08-30 | Procede de preparation de nitropyrazoles |
Country Status (4)
Country | Link |
---|---|
US (1) | US11530185B2 (fr) |
EP (1) | EP3844153A1 (fr) |
FR (1) | FR3085377B1 (fr) |
WO (1) | WO2020043998A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3130799A1 (fr) | 2021-12-17 | 2023-06-23 | Arianegroup Sas | Procédé de préparation du 3,5-dinitropyrazole |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2917409B1 (fr) | 2007-06-12 | 2010-06-04 | Snpe Materiaux Energetiques | Derives de dinitropyrazoles, leur preparation et les compositions energetiques les renfermant. |
EP2130821B1 (fr) | 2008-06-06 | 2011-09-21 | Sme | Dérivés du 3,4,5-trinitropyrazole, leur préparation et les compositions énergétiques les renfermant |
CN105669557A (zh) * | 2016-01-07 | 2016-06-15 | 北京理工大学 | 一种1-甲基-3,4,5-三硝基吡唑(mtnp)中间体3,5-二硝基吡唑的高选择性、高产率的无溶剂制备方法 |
-
2018
- 2018-08-31 FR FR1800916A patent/FR3085377B1/fr active Active
-
2019
- 2019-08-30 WO PCT/FR2019/052007 patent/WO2020043998A1/fr unknown
- 2019-08-30 US US17/271,492 patent/US11530185B2/en active Active
- 2019-08-30 EP EP19774159.8A patent/EP3844153A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
US11530185B2 (en) | 2022-12-20 |
US20210198210A1 (en) | 2021-07-01 |
FR3085377B1 (fr) | 2020-11-13 |
FR3085377A1 (fr) | 2020-03-06 |
WO2020043998A1 (fr) | 2020-03-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2464260A1 (fr) | Procede de fabrication du 5-hydroxymethylfurfural | |
EP0461096B1 (fr) | Procédé de fabrication de N-phénylmaléimide | |
EP1032557B1 (fr) | Procede de preparation de derives de bromomethyl-biphenyle | |
EP3844153A1 (fr) | Procede de preparation de nitropyrazoles | |
EP0168293B1 (fr) | Procédé de préparation d'anhydride trifluoracétique | |
FR2669636A1 (fr) | Procede de fabrication de furane 2,5-dicarboxaldehyde. | |
EP0421831B1 (fr) | Synthèse continue d'esters d'acides mercaptocarboxyliques | |
FR2708266A1 (fr) | Procédé de préparation d'alcanesulfonamides. | |
EP4178969B1 (fr) | Procédé de préparation de la diosmine | |
EP0013995B1 (fr) | Procédé pour la préparation de cétones macrocycliques acétyleniques | |
EP0272181B1 (fr) | Synthèse de dithiols | |
EP2531483A1 (fr) | Procede de preparation d'un ester d'acide carboxylique | |
EP0020281B1 (fr) | Préparation de benzoxazolone | |
EP4448496A1 (fr) | Procede de preparation du 3,5-dinitropyrazole | |
EP0158572B1 (fr) | Perfectionnement au procédé de préparation de la tri(M-sulfophényl)phosphine par hydrolyse et dilution contrôlées du sulfonat | |
FR2724378A1 (fr) | Procede de preparation de l'acide picrique | |
EP0687683B1 (fr) | Procédé de synthèse d'halogénoalkylferrocènes | |
FR2890965A1 (fr) | Hydrolyse ammoniacale de l'hydantoine de methionine sans catalyseur | |
EP0326455A1 (fr) | Procédé de préparation de chloranil | |
BE1008951A3 (fr) | Procede de fabrication de diborane de purete elevee. | |
EP0278875B1 (fr) | Procédé de préparation de méthoxy-3 méthylènedioxy-4,5 benzaldehyde | |
BE1004535A3 (fr) | Procede de production du n-(2-chloroethyl)-methanesulfonamide. | |
BE638289A (fr) | ||
EP0104974A1 (fr) | Procédé pour la production de dérivés de l'acide hydroxy-méthylène diphosphonique | |
FR2687668A1 (fr) | Procede de preparation de diamines alkylaromatiques, nouvelles diimines et diamines et utilisation des diamines obtenues pour la fabrication de polyamides. |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: UNKNOWN |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20210305 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAV | Request for validation of the european patent (deleted) | ||
DAX | Request for extension of the european patent (deleted) | ||
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: EURENCO Owner name: ARIANEGROUP SAS |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20230330 |