Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
  • C07C45/51—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition
  • C07C45/516—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds by pyrolysis, rearrangement or decomposition involving transformation of nitrogen-containing compounds to >C = O groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C45/00—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds
  • C07C45/56—Preparation of compounds having >C = O groups bound only to carbon or hydrogen atoms; Preparation of chelates of such compounds from heterocyclic compounds
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C47/00—Compounds having —CHO groups
  • C07C47/38—Unsaturated compounds having —CHO groups bound to carbon atoms of rings other than six—membered aromatic rings
  • C07C47/40—Unsaturated compounds having —CHO groups bound to carbon atoms of rings other than six—membered aromatic rings with a five-membered ring
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/06—Systems containing only non-condensed rings with a five-membered ring
  • C07C2601/10—Systems containing only non-condensed rings with a five-membered ring the ring being unsaturated

Definitions

• campholytic aldehyde has been prepared from expensive epoxy-verbenone as described e.g. by Bessiere-Chretien et al., Comptes Rendus des Seances de I'Academie des Sciences, Serie C: Sciences Chimiques (1971), 273(3), page 272- 275, or Amri et al., Journal de Ia Societe Chimique de Tunisie (1983), 10, page 25-32. 0
• campholytic aldehyde in high yields starting from campholenic aldehyde (2-(2,2,3- trimethylcyclopent-3-enyl)acetaldehyde), which is a relatively cheap bulk chemical, resulting in a relatively cheap campholytic aldehyde, which in turn may be used for the5 production of a new class of molecules. For example, it could be used for the production of a plurality of new fragrance ingredients. Furthermore, by using a relatively cheap starting material, the overall costs of production of certain fragrance ingredients can be held down. 0 The invention therefore provides a process for the preparation of campholytic aldehyde comprising
• R 1 and R 2 forming together with the nitrogen atom to which they are attached a cycling ring containing 4 to 7 carbon atoms and none or one further hetero atom selected from nitrogen and oxygen, e.g. morpholine, pyrrolidine, and piperidine;
• alkyl refers to linear or branched alkyl, saturated or unsaturated alkyl and cycloalkyl, such as methyl, ethyl, butyl, hexyl, and cyclohexyl.
• campholenic aldehyde is converted into the corresponding enamine, if necessary under Dean-Stark conditions known to the person skilled in the art. This is then oxidatively degraded using oxygen or air and copper catalysis to the corresponding campholytic aldehyde.
• the last step is performed in the presence of a solvent which is necessary for the reaction to proceed.
• a critical parameter for the selection of the solvent is the stability of the starting enamine. Thus, protic solvents are usually not ideal. Also, it is necessary that at least a small part of the copper catalyst be soluble in the solvent.
• the solvent may be selected from the family of secondary amides, such as dimethyl formamide or N-methyl-pyrrolidone and the like, and from the family of nitriles, such as acetonitrile, propionitrile and butyronitrile. It may also be an ether such as methyl tert.-butyl ether, tetrahydrofuran, 1 ,3-dioxane, 1 ,2- dimethoxyethane, diglyme and the like.
• chlorinated solvents have the ability to dissolve certain copper catalysts, very little or no transformation was observed in the presence of chlorinated solvents.
• Particularly preferred are polar aprotic solvents such as acetonitrile, dimethyl formamide and N-methyl-pyrrolidone.
• Copper(l) compounds such as copper(l) acetate, copper(l) bromide, copper(l) chloride, copper(l) iodide, copper(l) fluoride, copper(l) cyanide, copper(l) oxide, copper(l) thiocyanide, and complex compounds, such as tetrakis(acetonitrile)copper(l) hexafluorophosphate.
• Copper(ll) compounds such as copper(ll) acetate, copper(ll) acetylacetonate, copper(ll) bromide, copper(ll) chloride, copper(ll) ethylacetoacetate, copper(ll) fluoride, copper(ll) oxide, copper(ll) nitrate, copper(ll) oxalate, copper(ll) perchlorate, copper(ll) phthalocyanine, copper(ll) sulfate, copper(ll) tartrate, copper(ll) tetrafluoroborate, copper(ll) hydroxide, copper(ll) D-gluconate and copper(ll) formate.
• the preferred catalysts are copper(l) chloride and copper (II) chloride.
• the reaction temperature depends on the solvent used and can be between the solidifying and boiling temperature of the reaction mixture. Preferred reaction temperatures are from 0 0 C to 50 0 C and the most preferred temperature is about 20 to about 30 0 C.
• Amines of formula (I) include but are not limited to dimethylamine, diethylamine, dibutylamine, dihexylamine, dicyclohexylamine, N-methyl-benzylamine, morpholine, pyrolidine and piperidine.
• a flask is charged with campholenic aldehyde (1200 g, 6.9 mol) and morpholine (600 g, 6.9 mol) is added under stirring. The mixture is exothermic and warms to 75 0 C, while water separates. The mixture is transferred into a separating funnel and the water (105 ml) is removed. The crude product is distilled through a 10 cm-Vigruex column to afford the desired product (1240 g) as a pale yellow oil, bp. 118-120 0 C (0.2 mbar).

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• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
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• Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

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