EP4175950A1 - Neue verfahren zur herstellung von cis-cedrandiol - Google Patents
Neue verfahren zur herstellung von cis-cedrandiolInfo
- Publication number
- EP4175950A1 EP4175950A1 EP20740248.8A EP20740248A EP4175950A1 EP 4175950 A1 EP4175950 A1 EP 4175950A1 EP 20740248 A EP20740248 A EP 20740248A EP 4175950 A1 EP4175950 A1 EP 4175950A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- formula
- compound
- converting
- cis
- conversion
- 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
- C07D317/00—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms
- C07D317/08—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3
- C07D317/44—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems
- C07D317/70—Heterocyclic compounds containing five-membered rings having two oxygen atoms as the only ring hetero atoms having the hetero atoms in positions 1 and 3 ortho- or peri-condensed with carbocyclic rings or ring systems condensed with ring systems containing two or more relevant rings
-
- 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
- C07D303/16—Compounds containing oxirane rings with hydrocarbon radicals, substituted by singly or doubly bound oxygen atoms by esterified hydroxyl radicals
- C07D303/17—Compounds containing oxirane rings with hydrocarbon radicals, substituted by singly or doubly bound oxygen atoms by esterified hydroxyl radicals containing oxirane rings condensed with carbocyclic ring systems having three or more relevant rings
Definitions
- the present invention relates primarily to new processes for the preparation of c / s-cedrandiol.
- the present invention relates to a new compound of the formula X as described herein, preferably of the formula X ‘or - particularly preferably - of the formula 5a as described herein, and the use of such a compound of the formula 5a for the preparation of c / s-cedrandiol.
- Cedrandiols are important raw materials for the production of high-quality fragrances (Ambrocenide®, for example, with an annual production of several tons, is a particularly important representative). Due to its excellent odor properties as an acetonide, the c / s-cedrandiol is of particular interest.
- the production of c / s-cedrandiol usually takes place from cedar in a two-stage process. First, cedrene is oxidized to cedar epoxide and this epoxide is then opened to the diol (see e.g. EP 0 857 723 B1).
- the primary object of the present invention is achieved by a process for the preparation of c / s-cedrandiol, consisting of or comprising the steps: i) providing a compound of the formula 5
- a compound of the formula 5a is provided in step i), the providing comprising or consisting of the following steps: i.a1) providing a compound of the formula 6
- step i.a2) by means of esterification using acetic anhydride and a base, preferably an amine, more preferably a tertiary amine, particularly preferably DMAP, is preferred at a temperature in the range from 20 to 25 ° C.
- the conversion of the compound of formula 7 to a compound of formula 5a in step i.a3) is preferably carried out by means of epoxidation using a peracid, preferably m-CPBA (mefa-chloroperbenzoic acid), preferably at a temperature in the range from 20 to 100 ° C , more preferably at a temperature in the range from 20 to 30 ° C, particularly preferably at a temperature in the range from 20 to 25 ° C.
- a peracid preferably m-CPBA (mefa-chloroperbenzoic acid)
- a compound of the formula 5b is provided in step i) (as described above), the providing consisting of or comprising the following steps: i.b1) providing a compound of the formula 6
- step i.b2 the conversion of the compound of formula 6 to a compound of formula 5b in step i.b2) by means of epoxidation using a diimidazole, preferably 1,1′-sulfonyldiimidazole, preferably in combination with H2O2, preferably at one temperature in the range from 1 to 10 ° C.
- a diimidazole preferably 1,1′-sulfonyldiimidazole, preferably in combination with H2O2, preferably at one temperature in the range from 1 to 10 ° C.
- step i.a1) or i.b1) in the context of a method according to the invention preferably comprises the following steps or consists of these:
- the conversion of the compound of formula 1 to a compound of formula 6 is carried out by photooxidation, preferably using oxygen, rose bengal and light, preferably including reduction of the hydroperoxide with triphenylphosphine (for further preferred embodiments see examples below).
- the provision of the compound of the formula 6 in step i.a1) or i.b1) in the context of a method according to the invention preferably comprises the following steps or consists of these:
- the conversion of the compound of formula 2 to a compound of formula 6 is preferably carried out by epoxide rearrangement (a) using aminophenol (s), bifunctional phosphonium salt (s) and / or NbCls as a catalyst, preferably NbCl5, particularly preferably in combination with Bu 4 NBr as cocatalyst, or (b) using lithium diisopropylamide (LDA).
- epoxide rearrangement (a) using aminophenol (s), bifunctional phosphonium salt (s) and / or NbCls as a catalyst, preferably NbCl5, particularly preferably in combination with Bu 4 NBr as cocatalyst, or (b) using lithium diisopropylamide (LDA).
- LDA lithium diisopropylamide
- a reducing agent preferably hydrogen or a hydride reagent, for example boron or aluminum hydrides, preferably lithium aluminum hydride (L1AIH4), preferably at a temperature in the range from -5 to 5 ° C, preferably at about 0 ° C.
- a reducing agent preferably hydrogen or a hydride reagent, for example boron or aluminum hydrides, preferably lithium aluminum hydride (L1AIH4), preferably at a temperature in the range from -5 to 5 ° C, preferably at about 0 ° C.
- a process according to the invention as described herein is also a process for the preparation of a compound of the formula c / s-4a (key component of Ambrocenide®), cis-4a also comprising the following step: iii) converting the compound of the formula cis-3a into a compound of the formula c / s-4a.
- the conversion of the compound of the formula cis-3a to a compound of the formula c / s-4a in step iii) is preferably carried out by acetalization of the compound of the formula cis-3a, preferably using 2,2-dimethoxypropane in combination with para Toluenesulfonic acid (p-TSA) or sulfuric acid as a catalyst, preferably at a temperature in the range from 20 to 45 ° C.
- p-TSA para Toluenesulfonic acid
- sulfuric acid as a catalyst
- a compound is also provided which is new per se, namely a compound of the formula X. preferably of the formula X '
- a compound of the formula 5a as defined herein is advantageously outstandingly suitable for the preparation of a compound of the formula cis-3a or a compound of the formula c / s-4a preferably in the context of a method according to the invention as described herein.
- cedrene epoxide of the formula 2 (as described herein), which is available, for example, starting from a compound of the formula 1 (as described herein), represents an attractive alternative route.
- Da Silva and coworkers (MG Constantino, VL Rheinnior, PR Invernize, LC d.S. Filho, GV Jose da Silva, Synth. Commun. 2007, 37, 3529-3539) reported on the isomerization of Monoterpene epoxies. Kolomeyer et al.
- the stereochemistry of the allyl alcohol of the formula 6 synthesized by photooxidation was determined using NOESY experiments. From the LDA-mediated isomerization it was possible to obtain crystals suitable for X-ray crystallographic studies and to confirm the stereochemistry of the compound of formula 6.
- the compound of formula 6 was initially obtained in an excellent yield of 95% according to a modified protocol that was described by Tomi et al. (F. Tomi, A. Bighelli, J. Casanova, Spectrosc. Lett. 1993, 26, 1661-1671) converted into the corresponding acetate of formula 7 using DMAP as acylation catalyst in the absence of an additional base (reaction conditions: DMAP (5 mol%), AC2O, CH2Cl2, 21 ° C, 17 hrs.).
- the compound of the formula 5a was then obtained in 59% yield by epoxidation with m-CPBA at 100 ° C. When the reaction was carried out at ambient temperature, an increased yield of 88% was achieved (reaction conditions: m-CPBA, CH 2 Cl 2, 21 ° C., 20 hours).
- the key component in the Ambrocenide® product mentioned at the outset is the compound of the formula c / s-4a (as described herein; see also Example 4 below). It is therefore important that the epoxidation occurs in the c / s orientation with respect to the acetate group.
- the compound of formula 5 (as described herein), here of formula 5a was reduced with LiAIFU (reaction conditions: LiAIFU, CH 2 Cl 2, 0 ° C., 2 hours). This enables the ring opening of the epoxide to the tertiary alcohol regioselectively and leads to the cleavage of the acetate group.
- the compound of formula cis-3a (as described herein) was obtained in an excellent yield of 94%.
- the stereochemistry was confirmed both by NOESY experiments and by the molecular structure obtained by X-ray analysis.
- This epoxidation-reduction sequence improved the overall yield of cis-3a to 95% starting from the compound of formula 2.
- IR (ATR): l 2954 (s), 2871 (m), 1728 (vs), 1470 (w), 1372 (s), 1292 (w), 1230 (vs), 1197 (m), 1168 (w ), 1139 (w), 1113 (w), 1060 (w), 1040 (m), 1016 (m), 974 (s), 941 (m), 925 (w), 907 (w), 888 (m ), 805 (m), 769 (w), 742 (w), 687 (m), 653 (w), 623 (m), 559 (m), 502 (m), 480 (s) 434 (w) crrv 1 .
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Epoxy Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2020/068490 WO2022002380A1 (de) | 2020-07-01 | 2020-07-01 | Neue verfahren zur herstellung von cis-cedrandiol |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4175950A1 true EP4175950A1 (de) | 2023-05-10 |
Family
ID=71614855
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP20740248.8A Pending EP4175950A1 (de) | 2020-07-01 | 2020-07-01 | Neue verfahren zur herstellung von cis-cedrandiol |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4175950A1 (de) |
| WO (1) | WO2022002380A1 (de) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19704484A1 (de) * | 1997-02-06 | 1998-09-03 | Dragoco Gerberding Co Ag | Cyclische Cedren-Acetale, ihre Herstellung und ihre Verwendung |
| US6835686B2 (en) * | 2001-07-05 | 2004-12-28 | Millennium Specialty Chemicals | Catalyst system and process for rearrangement of epoxides to allylic alcohols |
-
2020
- 2020-07-01 WO PCT/EP2020/068490 patent/WO2022002380A1/de not_active Ceased
- 2020-07-01 EP EP20740248.8A patent/EP4175950A1/de active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2022002380A1 (de) | 2022-01-06 |
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