EP4680599A1 - Procédé de synthèse du composé 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dién-6-one - Google Patents
Procédé de synthèse du composé 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dién-6-oneInfo
- Publication number
- EP4680599A1 EP4680599A1 EP24711542.1A EP24711542A EP4680599A1 EP 4680599 A1 EP4680599 A1 EP 4680599A1 EP 24711542 A EP24711542 A EP 24711542A EP 4680599 A1 EP4680599 A1 EP 4680599A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- process according
- compound
- aqueous solution
- hydroxy
- ether
- 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
- C07D301/00—Preparation of oxiranes
- C07D301/02—Synthesis of the oxirane ring
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D303/00—Compounds containing three-membered rings having one oxygen atom as the only ring hetero atom
- C07D303/02—Compounds containing oxirane rings
- C07D303/12—Compounds containing oxirane rings with hydrocarbon radicals, substituted by singly or doubly bound oxygen atoms
- C07D303/32—Compounds containing oxirane rings with hydrocarbon radicals, substituted by singly or doubly bound oxygen atoms by aldehydo- or ketonic radicals
Definitions
- the aim of the invention is to solve the technical problem of obtaining a direct or one-step synthesis of the compound 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6-one, with an excellent yield, and using one or more non-toxic reagents and a reaction medium.
- the invention aims to solve this technical problem with a short reaction time, of the order of a few minutes.
- the invention also aims to solve this technical problem starting from an available, inexpensive substance.
- the invention also aims to solve these problems according to a simple, safe, reliable, reproducible and usable solution on an industrial scale in order to avoid any agent likely to cause environmental problems. 4. Summary and detailed description of the process according to the invention: The invention solves these technical problems for the first time starting from an available starting substance, 4-Hydroxy-3,5-diiodobenzyl alcohol, the synthesis of which from 4-hydroxybenzyl alcohol has also been the subject of a patent filed by INNOVERDA published under No. FR 3,113,904B2.
- the invention relates to a process for the direct synthesis in a single step of the compound 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6-one from 4-Hydroxy-3,5-diiodobenzyl alcohol, characterized in that an oxidation reaction of 4-Hydroxy-3,5-diiodobenzyl alcohol is carried out with an oxidant. comprising or consisting of a hypochlorite, in particular chosen from sodium, calcium, potassium hypochlorite, or mixtures thereof.
- this oxidation reaction is carried out in a two-phase reaction medium 5 comprising a polar organic solvent of ether type and an aqueous solution.
- the polar organic solvent of ether type is chosen from methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), diethyl ether, and methyl cyclopentyl ether, or mixtures thereof.
- the aqueous solution is chosen from water, in particular demineralized water, or an aqueous buffer, in particular an aqueous buffer whose pH is between 5 and 8, better still between 6 and 7.
- a suitable aqueous buffer is an acetate buffer.
- the relative molar ratio between the hypochlorite oxidant and the 4-Hydroxy-3,5-diiodobenzyl alcohol is between 2 and 3, in particular between 2 and 2.5.
- the volume ratio of the aqueous solution relative to the total volume of the aqueous solution and the polar organic solvent of ether type is between 2 and 21%, in particular between 5 and 12%, even better approximately 6%.
- the temperature of the reaction medium is between approximately 0 and room temperature or lower than room temperature, in particular between approximately 0 and approximately 21°C.
- the reaction time is between 1 and 15 minutes, in particular between 4 and 10 minutes.
- the 4-hydroxy-3,5-diiodobenzyl alcohol is dissolved in the polar organic solvent and the hypochlorite oxidant is dissolved in the aqueous solution.
- the molar concentration of the hypochlorite oxidant in the aqueous solution is from 0.5M to 1.5M.
- the aqueous solution 5 is added gradually to the polar organic solution, in particular dropwise, over a period of time of 1 to 15 minutes, in particular 4 to 10 minutes, with stirring, in particular vigorous stirring.
- vigorous stirring is meant stirring creating a vortex as is well known to those skilled in the art. This vortex is generally achieved with a rotation speed between 800 – 1200 revolutions per minute.
- the process can be carried out at room temperature. 5.
- the process does not use toxic heavy metals or rare metals and the resulting by-products of the oxidant are non-toxic (H2O and NaCl).
- the invention implements the use of hypochlorite salts for the 5 synthesis of the compound 1, 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6-one, a di-iodinated spiro-epoxide, surprisingly and unexpectedly resulting in a high yield in a few minutes.
- the use of sodium and calcium hypochlorite as an oxidant in a chemical reaction is not new.
- Ether type solvents are used in a two-phase medium, in the presence of a certain percentage of aqueous solution or final water, between 2 and 21%, in particular between 5 and 12%, and even better approximately 6% (Examples 1, 7 and 8) and a concentration of hypochlorite in the water or aqueous solution, between 0.5M and 1.5M.
- An ether chosen from methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), diethyl ether or methyl cyclopentyl ether is used as the polar organic solvent. (Examples 1, 2, 3 and 4).
- aqueous solution a buffer solution, for example at a pH between 5 and 8, better between 6 and 7, for example an acetate buffer solution (example 11).
- other solvents such as respectively dimethyl carbonate, 2-methyl tetrahydrofuran, isopropyl acetate, n-butanol, ethanol, anisole, toluene, n-heptane, cyclohexane, dimethyl sulfoxide, acetonitrile, N,N-dimethylformamide respectively give significantly lower or zero yields of the desired compound. (Respectively examples 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32 and 33).
- oxidant 25 ⁇ between 2-3, in particular 2-2.5, equivalents of oxidant are used (Example 1).
- other oxidants such as respectively potassium hydrogen persulfate (Oxone), sodium bismuthate, iodobenzene diacetate (PIDA), tetra-n-butylammonium triiodide (TBAI3) and bromine with sodium hydroxide do not allow to obtain the desired compound 1 (Respectively examples 37, 38, 39, 40, 41, 42 and 43).
- ⁇ a temperature between 0 and 21 °C (Examples 1, 5, 6, 34 and 35).
- Example 1 Optimal protocol 4-hydroxy-3,5-diiodobenzyl alcohol be prepared from 4-hydroxy benzyl alcohol, according to one of examples 1 to 8 of INNOVERDA patent FR-3,113,904B2. 100 mg (266 ⁇ moles) of 4-hydroxy-3,5-diiodobenzyl alcohol is dissolved in 11 mL of methyl tert-butyl ether (MTBE).
- MTBE methyl tert-butyl ether
- Example 3 The procedure is as described in Example 1 but using diethyl ether instead of methyl tert-butyl ether (MTBE), 61% of compound 1 is obtained.
- Example 4 The procedure is as described in Example 1 but using methyl cyclopentyl ether instead of methyl tert-butyl ether (MTBE), 50% of compound 1 is obtained.
- Change in temperature The procedure is as described in Example 1 except for the modification described in Table I below. 10 Table I- Change in temperature Examples Modifications Yield (compound 1)
- Example 5 The aqueous fraction containing 61% sodium hypochlorite is added at 0 °C.
- Example 6 The aqueous fraction containing 60% sodium hypochlorite is added at 10 °C.
- Example 8 Using 414 mg (1.10 mmol) of 4-hydroxy-3,5-63% diiodobenzyl alcohol in 11 mL of methyl tert-butyl ether and 362 mg (2.20 mmol) of sodium hypochlorite pentahydrate in 2.89 mL of demineralized water. Change of scale: Proceeding as described in Example 1 with the exception of the modification described in Table III below. Table III- Change of scale Examples Modifications Yield (compound 1)
- Example 9 1.0 g of 4-hydroxy-3,5-diiodobenzyl alcohol 53% are used as starting product. All other reagents are increased in proportion (x10).
- Example 10 2.5 g of 4-hydroxy-3,5-diiodobenzyl alcohol 53% are used as starting product. All other reagents are increased in proportion (x25).
- Example Use of borate buffer (B(OH)3/NaOH) 38% comparative 13 0.1M pH 8.6 instead of demineralized water.
- Example Use of acetate buffer (AcOH/AcONa) 29% comparative 14 0.1M pH 5 instead of demineralized water.
- Example Use of acetate buffer (AcOH/AcONa) 0% comparative 15 0.1M pH 4 instead of demineralized water.
- Example of the invention 16 100 mg (266 ⁇ moles) of 4-hydroxy-3,5-diiodobenzyl alcohol is dissolved in 11 mL of ethyl acetate. Separately, 58.2 mg (354 ⁇ moles) of sodium hypochlorite pentahydrate is dissolved in 0.7 mL of demineralized water (final organic/water ratio 94/6). The aqueous fraction is added to the organic fraction with vigorous stirring and at 21 °C. The reaction is stirred for 5 minutes. The reaction is stopped by the addition of 10 mL of a 10% sodium bisulfite solution.
- Example of the invention 100 mg (266 ⁇ moles) of 4-hydroxy-3,5-diiodobenzyl alcohol is dissolved in 11 mL of methyl tert-butyl ether. Separately, 38.0 mg (266 ⁇ mol) of calcium hypochlorite is dissolved in 0.7 mL of demineralized water.
- Comparative example 40 100 mg (266 ⁇ moles) of 4-hydroxy-3,5-diiodobenzyl alcohol and 36.8 mg (266 ⁇ moles) of potassium carbonate are dissolved in 10 mL of ethyl acetate and 0.7 mL of demineralized water. Separately, 136 mg (266 ⁇ mol) of tetra-n-butylammonium triiodide is dissolved in 1 mL of ethyl acetate. The small organic fraction 20 is added in one portion to the large organic fraction with vigorous stirring and at 21 °C. The reaction is stopped by the addition of 10 mL of demineralized water.
- Reaction 30 is stopped by the addition of 10 mL of a 10% sodium bisulfite solution.
- 0% of 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6one (compound 1) is obtained.
- Comparative Example 42 100 mg (266 ⁇ moles) of 4-hydroxy-3,5-diiodobenzyl alcohol and 6.84 mg (26.6 ⁇ moles) of tetrabutylammonium iodide are dissolved in 11 mL of ethyl acetate.
- Comparative example 43 100 mg (266 ⁇ moles) of 4-hydroxy-3,5-diiodobenzyl alcohol is dissolved in 11 mL of toluene. Separately, 219 mg (1.33 mmol) of sodium hypochlorite pentahydrate is dissolved in 11 mL of demineralized water (final organic/water ratio 50/50). The aqueous fraction is added to the organic fraction with vigorous stirring and at 21 °C. The reaction is stirred for 120 minutes. The reaction is stopped by the addition of 10 mL of a 10% sodium bisulfite solution.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Heterocyclic Carbon Compounds Containing A Hetero Ring Having Oxygen Or Sulfur (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2302388A FR3146678B1 (fr) | 2023-03-15 | 2023-03-15 | Procédé de synthèse du composé 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dien-6-one |
| PCT/EP2024/056787 WO2024189137A1 (fr) | 2023-03-15 | 2024-03-14 | Procédé de synthèse du composé 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dién-6-one |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4680599A1 true EP4680599A1 (fr) | 2026-01-21 |
Family
ID=86764940
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP24711542.1A Pending EP4680599A1 (fr) | 2023-03-15 | 2024-03-14 | Procédé de synthèse du composé 5,7-diiodo-1-oxaspiro[2,5]octa-4,7-dién-6-one |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP4680599A1 (fr) |
| FR (1) | FR3146678B1 (fr) |
| WO (1) | WO2024189137A1 (fr) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130017163A1 (en) | 2011-07-14 | 2013-01-17 | Latham Keith R | Halogenated phenols for diagnostics, antioxidant protection and drug delivery |
| FR3113904B1 (fr) | 2020-09-08 | 2022-08-12 | Innoverda | Procédé de synthèse du 3,5-diiodo-4-hydroxy benzylalcool |
-
2023
- 2023-03-15 FR FR2302388A patent/FR3146678B1/fr active Active
-
2024
- 2024-03-14 EP EP24711542.1A patent/EP4680599A1/fr active Pending
- 2024-03-14 WO PCT/EP2024/056787 patent/WO2024189137A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| FR3146678B1 (fr) | 2025-09-05 |
| WO2024189137A1 (fr) | 2024-09-19 |
| FR3146678A1 (fr) | 2024-09-20 |
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