Abstract:
The compounds of formula                            
     wherein the acetyl substituting group is either in position 2 or in position 3 of the cycle, or any mixture of compounds of formula (I) are novel compounds which can namely confer a natural odor of the leather type to products or compositions to which they are added.

Description:
BRIEF SUMMARY OF THE INVENTION 
     The present invention relates to novel compounds useful in the field of perfumery. It concerns more particularly the compounds of formula                           
     wherein the acetyl substituting group is either in position 2 or in position 3 of the ring, or any mixture of compounds of formula (I). Any further reference to a compound of formula (I) in the present application will designate either one or the other structural isomer or a mixture of both. 
     The compounds (I) possess odor properties which are very useful and appreciated. Therefore, they can be used for the preparation of perfumes, perfuming compositions and perfumed articles. These compounds can namely confer odor effects of the natural leather type. 
     BACKGROUND OF THE INVENTION 
     The compounds according to the present invention are novel. 
     The use in the field of perfumery of compounds having a structure close to that of the compounds (I) is known in the prior art. One can cite the patents U.S. Pat. No. 3,929,677 and EP 743 297 which disclose such compounds and discuss their odor properties. 
     DETAILED DESCRIPTION OF THE INVENTION 
     Surprisingly, we have now been able to establish that the compounds of formula (I) have a fragrance of a totally original character compared with the odor of known compounds. In fact, the odor of the compounds (I) constitutes an ensemble of woody, powdery-violet, ambergris, slightly marine seaweed type notes, accompanied with a very natural and really unexpected leather type connotation, reminiscent of the odor of fresh Suede leather. This last connotation really distinguishes the compounds of the present invention from the products of similar structure which are described in the prior art, thus conferring to said compounds a great value for their use in perfumery. 
     The compounds according to the present invention thus make it possible to confer, improve, enhance or modify the odor of consumer products, as well as perfuming bases or concentrates. In other words, they can impart to the latter their characteristic odor, as the case may be modifying and/or improving the original odor properties of the products and compositions in which they are incorporated. These products thus become more appealing to the consumer and have an enhanced odor impact. 
     The compounds of the invention can be used in fine perfumery, namely in perfumes, colognes, or after-shave lotions, as well as in other current uses in perfumery, namely to perfume soaps, shower or bath gels, hygiene or hair care products such as shampoos and also body or ambient air deodorants and cosmetic preparations. 
     The compounds (I) can also be used in applications such as liquid or solid detergents for textile treatment, fabric softeners, or yet detergent compositions or cleaning products for dishes or varied surfaces. 
     In these applications, said compounds (I) can be used alone as well as mixed with other perfuming ingredients, solvents or additives commonly used in perfumery. The nature and variety of these coingredients do not require a more detailed description here, which would not be exhaustive anyway. In fact, a person skilled in the art, having a general knowledge, is able to choose them according to the nature of the product that has to be perfumed and the olfactory effect sought. 
     These perfuming coingredients belong to varied chemical groups such as alcohols, aldehydes, ketones, esters, ethers, acetates, nitrites, terpenic hydrocarbons, heterocyclic nitrogen- or sulfur-containing compounds, as well as natural or synthetic essential oils. Many of these ingredients are listed in reference texts such as S. Arctander, Perfume and Flavor Chemicals, 1969, Montclair, N.J., USA, or more recent versions thereof, or in other similar books. 
     The proportions in which the compounds according to the invention can be incorporated in the different products mentioned above vary in a broad range of values. These values depend on the nature of the product that has to be perfumed and on the olfactory effect sought, as well as on the nature of the coingredients in a given composition when the compounds of the invention are used in admixture with perfuming coingredients, solvents or additives commonly used in the art. 
     For instance, concentrations from 5 to 10% by weight, or even 20% by weight, of the compounds of the invention, relative to the weight of the perfuming composition in which they are incorporated, can be used. Much lower concentrations than these can typically be used when these compounds are directly applied for perfuming some of the consumer products mentioned above. 
     The invention also relates to a process for the preparation of the compounds of formula (I). According to the process of the invention, an alcohol of formula                           
     is subjected to a Diels Alder type reaction in the presence of a methylvinyl ketone, and this reaction is followed by dehydration and cyclisation. These three steps are effected in a one pot “cascade” reaction. 
     The alcohol of formula (II) is a novel compound and constitutes another object of the present invention. The latter can be obtained by a Grignard type reaction, starting from epoxymyrcene. 
     The whole synthesis can be described as follows:                           
     The reaction conditions are described in more detail in an example presented hereafter. 
     The invention will now be described in greater detail in the following examples, wherein the temperatures are indicated in degrees centigrade and the abbreviations have the usual meaning in the art. 
    
    
     EXAMPLE 1 
     Preparation of 1-(1,2,3,4,5,6,7,8-octahydro-7,8,8-trimethyl-2-naphtalenyl)-1-ethanone 
     a) 1230 ml of a solution of CH 3 MgCl 3M in tetrahydrofurane (Fluka) was added to 26.5 g of CuBr (Fluka) in 11 of diisopropylether with stirring at 0° (bath temperature). After one night, the reaction mixture was cooled to −20° and 467 g of epoxymyrcene [2-(3,4-epoxy-4-methylpentyl)-1,3-butadiene] in 4 l of isopropylether were added dropwise. After the addition, the reaction mixture was warmed to room temperature. After 23 h the reaction was completed. After hydrolysis with a 15% NH 4 Cl-solution and washing with brine, the product was distilled to obtain 96.6% pure 2,3-dimethyl-6-methylene-7-octen-2-ol with a yield of 453.7 g (88%). 
     Boiling point: 75°/40 Pa 
     Spectral data of 2,3-dimethyl-6-methylene-7-octen-2-ol 
     NMR( 1 H): 0.95(d, J=6,8, 3H); 1.16 and 1.17(2s, 6H); 5.01(s, 2H); 5.06(d, J=11,2, 1H); 5.23(d, J=17,6, 1H); 6.37(dd, J 1 =11,2, J 2 =17,6, 1H) 
     NMR( 13 C): 14.5(q); 26.2(q); 27.1(q); 30.1(t); 30.3(t); 44.2(d); 73.4(s); 113.2(t); 115.7(t); 138.9(d); 146.6(s) 
     MS: 168(M + , 0), 153(1), 150(4), 135(9), 107(7), 95(12), 81(21), 68(49), 59(100), 41(37) 
     b) To a solution of the product obtained under a) (300 g), but-1-en-3-one (147.5 g; Fluka) and toluene (3 l) were added with BF 3 .ethylether (30 ml) under stirring. The exothermic reaction increased the temperature of the reaction medium from 23° to 33°. The latter was then heated to 40°. After 22 h, the Diels-Alder type reaction was completed. Again some BF 3 .ethylether was added; the reaction mixture became brown, and then dark brown after 45 h. The reaction mixture was washed with a 10% NaOH solution and brine, and then distilled to provide the desired product in the form of a mixture of compounds comprising 1-(1,2,3,4,5,6,7,8-octahydro-7,8,8-trimethyl-2-naphtalenyl)-1-ethanone (2 diastereomers) and 1-(1,2,3,4,5,6,7,8-octahydro-5,5,6-trimethyl-2-naphtalenyl)-1-ethanone. The yield was 258.2 g (65%). 
     Spectral data of the products which have been elucidated after separating the mixture via gas chromatography: 
     Cis-1-(1,2,3,4,5,6,7,8-octahydro-7,8,8-trimethyl-2-naphtalenyl)-1-ethanone 
     NMR( 1 H): 0.88(d, J=6, 3H); 0.89(s); 1.02(s); 2.17(s) 
     NMR( 13 C): 16.4(q); 22.7(q); 25.2(t); 26.6(t); 26.9(t); 27.8(q); 28.4(q); 29.2(t);30.5(t); 37.2(s); 39.3(d); 48.8(d); 126.8(s); 132.8(s); 212.6(s) 
     MS: 220(M + , 35), 205(40), 177(57), 161(14), 135(20), 119(23), 107(38), 91(69), 43(100) 
     Trans-1-(1,2,3,4,5,6,7,8-octahydro-7,8,8-trimethyl-2-naphtalenyl)-1-ethanone 
     NMR( 1 H): 0.89(d, J=6, 3H); 0.82 et 0.97(2s, 6H); 2.19(s, 3H) 
     NMR( 13 C): 17.0(q); 20.5(q); 25.5(t); 25.7(q); 27.2(t); 27.6(t); 28.5(q); 31.1(2t); 39.7(d); 49.2(d); 127.2(s); 134.2(s); 213.0(s) 
     MS: 220(M + , 38), 205(42), 177(57), 161(14), 135(22), 119(24), 107(41), 91(67), 43(100) 
     Cis-1-(2-isopropyl-2-methyl-1-oxaspiro[4.5]dec-8-yl)-1-ethanone 
     NMR( 1 H): 0.84 and 0.92(2d, J=6,8, 6H); 1.06(s, 3H); 2.13(s, 3H) 
     NMR( 13 C): 17.9(q); 18.4(q); 23.3(q); 24.6(t); 25.0(t); 27.6(q); 34.4(t); 37.2(t); 37.9(t); 38.2(t); 38.4(d); 51.1(d); 80.2(s); 85.9(s); 212.2(s) 
     MS: 238(M + , 1), 223(3), 195(100), 177(41), 153(30), 135(30), 119(17), 93(12), 83(12), 43(23) 
     Trans-1-(2-isopropyl-2-methyl-1-oxaspiro[4.5]dec-8-yl)-1-ethanone 
     NMR( 1 H) 0.86 and 0.92(2d, J=6,8, 6H); 1.11 (s, 3H); 2.14(s, 3H) 
     NMR( 13 C) 17.9(q); 18.4(q); 23.8(q); 26.5(2t); 28.3(q); 34.19(t); 34.31(t); 37.2(t); 37.9(d); 38.6(t); 50.2(d); 82.5(s); 85.4(s); 211.9(s) 
     MS: 238(M + , 0,5), 223(1), 195(60), 177(23), 153(21), 135(22), 119(14), 93(13), 83(16), 71(17), 43(100) 
     EXAMPLE 2 
     Perfuming composition 
     A base perfuming composition was prepared for a feminine cologne having a flowery-herbaceous character by admixing the following ingredients: 
     
       
         
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredients 
                 Parts by weight 
               
               
                   
                   
               
             
             
               
                   
                 Hexyl acetate 
                 20 
               
               
                   
                 Benzyl acetate 
                 150 
               
               
                   
                 Carbinol acetate 
                 20 
               
               
                   
                 Citronellyl acetate 
                 80 
               
               
                   
                 Geranyl acetate 
                 180 
               
               
                   
                 Linalyl acetate 
                 25 
               
               
                   
                 Phenylethyl acetate 
                 50 
               
               
                   
                 1%* cis-3-Hexenol acetate 
                 40 
               
               
                   
                 10%* Anisic aldehyde 
                 130 
               
               
                   
                 10%* Allyl amyl glycolate 
                 20 
               
               
                   
                 10%* Ambrettolide ® 1)   
                 80 
               
               
                   
                 Methyl anthranilate 
                 10 
               
               
                   
                 10%* Cetalox ® 2)   
                 25 
               
               
                   
                 1%* cis-3-Hexenol 
                 40 
               
               
                   
                 Citronellol 
                 80 
               
               
                   
                 Dihydromyrcenol 
                 75 
               
               
                   
                 10%* β-Dorinone ® 3)   
                 25 
               
               
                   
                 10%* Ethylvanilline 
                 40 
               
               
                   
                 Eugenol 
                 20 
               
               
                   
                 Exaltolide ® 4)   
                 170 
               
               
                   
                 Firsantol ® 5)   
                 10 
               
               
                   
                 10%* Floralozone ® 6)   
                 20 
               
               
                   
                 Galaxolide ® 7) 50 
                 730 
               
               
                   
                 Geraniol 
                 10 
               
               
                   
                 Hedione ® 8)   
                 600 
               
               
                   
                 Helional ® 9)   
                 10 
               
               
                   
                 10% Indol* 
                 10 
               
               
                   
                 Iralia ® total 10)   
                 10 
               
               
                   
                 10%* Liffarome ® 11)   
                 10 
               
               
                   
                 Lilial ® 12)   
                 260 
               
               
                   
                 Lyral ® 13)   
                 30 
               
               
                   
                 1%* Rose oxide 
                 50 
               
               
                   
                 1%* p-Cresol 
                 30 
               
               
                   
                 Phenethylol 
                 130 
               
               
                   
                 Polysantol ® 14)   
                 50 
               
               
                   
                 Portugal Brazil orange essential oil 
                 20 
               
               
                   
                 Benzyl salicylate 
                 100 
               
               
                   
                 Cis-3-Hexenol salicylate 
                 150 
               
               
                   
                 Tonalide ® 15)   
                 60 
               
               
                   
                 10%* Undecalactone gamma 
                 40 
               
               
                   
                 Vanilline 
                 50 
               
               
                   
                 10%* Ylang extra essential oil 
                 50 
               
               
                   
                 Total 
                 3700 
               
               
                   
                   
               
               
                   
                 *in dipropylene glycol (DIPG)  
               
               
                   
                   1) 9-hexadecen-16-olide; origin:Givaudan-Roure SA, Vernier, Switzerland  
               
               
                   
                   2) 8,12-epoxy-13,14,15,16-tetranorlabdane; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   3) β-damascone; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   4) pentadecanolide; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   5) 2-methyl-4-(2,2,3-trimethyl-3′-cyclopenten-1-yl)-4-penten-1-ol; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   6) 3-(4-ethyl-1-phenyl)-2,2-dimethylpropanal; origin:International Flavors and Fragrances, USA  
               
               
                   
                   7) origin:International Flavors and Fragrances, USA  
               
               
                   
                   8) methyl dihydrojasmonate; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   9) 1-(4-methoxyphenyl)-1-ethanone; origin:Givaudan-Roure SA, Vernier, Switzerland  
               
               
                   
                   10) methylionone; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   11) cis-3-hexenyl methyl carbonate; origin:International Flavors and Fragrances, USA  
               
               
                   
                   12) 3-(4-ter-buthylphenyl)-2-methylpropanal; origin:Givaudan-Roure SA, Vernier, Switzerland  
               
               
                   
                   13) 4-(4-hydroxy-4-methylpentyl)-3-cyclohexene carboxaldehyde; origin:International Flavors and Fragrances, USA  
               
               
                   
                   14) 3,3-dimethyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   15) 6-acetyl-1,1,3,4,4,6-hexamethyl-tetrahydronaphtalene; origin:Polak&#39;s Frutal Works  
               
             
          
         
       
     
     The addition of 300 parts by weight of the compounds of formula (I) according to the invention gives to this flowery-herbaceous base accord a lovely woody-leather connotation which is totally original, and which cannot be achieved by any combination of woody and leathery products known from the prior art. 
     EXAMPLE 3 
     Perfuming composition 
     A base perfuming composition for a masculine cologne of the chypre-leather type was prepared by admixing the following ingredients: 
     
       
         
               
               
             
           
               
                   
               
               
                 Ingredients 
                 Parts by weight 
               
               
                   
               
             
             
               
                 Geranyl acetate 
                 5 
               
               
                 Linalyl acetate 
                 70 
               
               
                 Bergamot essential oil 
                 560 
               
               
                 Sfuma lemon essential oil 
                 60 
               
               
                 Coumarin 
                 50 
               
               
                 Dihydromyrcenol 
                 80 
               
               
                 Eugenol 
                 5 
               
               
                 Habanolide ® 1)   
                 480 
               
               
                 Hedione ® HC 2)   
                 100 
               
               
                 10%* Indol 
                 25 
               
               
                 β-Ionone 
                 5 
               
               
                 10%* Isobutylquinoleine ® 3)   
                 10 
               
               
                 Lyral ® 4)   
                 250 
               
               
                 Sfuma mandarine essential oil 
                 290 
               
               
                 10%* Mousse cristal 
                 140 
               
               
                 Nutmeg Oil 
                 30 
               
               
                 10%* trans-1-(2,2,6-Trimethyl-1-cyclohexyl)-3-hexanol 5)   
                 55 
               
               
                 Patchouli oil 
                 70 
               
               
                 Amyl salicylate 
                 80 
               
               
                 Tonalide ® 6)   
                 400 
               
               
                 10%* Triplal ® 7)   
                 30 
               
               
                 10%* Undecalactone gamma 
                 5 
               
               
                 Vertofix Coeur 8)   
                 400 
               
               
                 Total 
                 3200 
               
               
                   
               
               
                 *in dipropylene glycol (DIPG)  
               
               
                   1) pentadecenolide; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   2) methyl cis-dihydrojasmonate; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   3) origin:International Flavors and Fragrances, USA  
               
               
                   4) 4-(4-hydroxy-4-methylpentyl)-3-cyclohexen-1-carboxaldehyde; origin:International Flavors and Fragrances, USA  
               
               
                   5) origin:Firmenich SA, Geneva, Switzerland  
               
               
                   6) 6-acetyl-1,1,3,4,4,6-hexamethyl-tetrahydronaphtalene; origin:Polak&#39;s Frutal Works  
               
               
                   7) 2,4-dimethyl-3-cyclohexen-1-carboxaldehyde; origin:International Flavors and Fragrances, USA  
               
               
                   8) origin:International Flavors and Fragrances, USA  
               
             
          
         
       
     
     The addition of 1000 parts by weight of the compound of formula (I) brings to this masculine chypre-leather composition a pleasant connotation which is very natural and reinforces the woody note conferred by the Vertofix Coeur. On the other hand, the fragrance becomes more masculine. 
     EXAMPLE 4 
     Perfuming composition 
     A base perfuming composition of the spicy-ylang type for a powder detergent was prepared by admixing the following ingredients: 
     
       
         
               
               
               
             
           
               
                   
                   
               
               
                   
                 Ingredients 
                 Parts by weight 
               
               
                   
                   
               
             
             
               
                   
                 Verdyl acetate 
                 40 
               
               
                   
                 50%* Cinnamic alcohol 
                 70 
               
               
                   
                 Anisic aldehyde 
                 10 
               
               
                   
                 10%* C11 Undecyclic aldehyde 
                 20 
               
               
                   
                 50%* C12 Aldehyde 
                 40 
               
               
                   
                 50%* Cinnamic aldehyde 
                 10 
               
               
                   
                 1%* Phenylacetic aldehyde 
                 50 
               
               
                   
                 10%* Methyl benzoate 
                 35 
               
               
                   
                 Benzophenone 
                 100 
               
               
                   
                 4-Cyclohexyl-2-methyl-2-butanol 1)   
                 120 
               
               
                   
                 Dihydromyrcenol 
                 135 
               
               
                   
                 50%* Habanolide ® 2)   
                 300 
               
               
                   
                 Hedione ® 3)   
                 70 
               
               
                   
                 Heliotropine 
                 20 
               
               
                   
                 10%* Indolarome ® 4)   
                 50 
               
               
                   
                 Iralia ® total 5)   
                 250 
               
               
                   
                 Lavandin Grosso essential oil 
                 50 
               
               
                   
                 Methylisoeugenol 
                 20 
               
               
                   
                 Methyl-para-cresol 
                 5 
               
               
                   
                 10%* Methyl octin carbonate 
                 15 
               
               
                   
                 Rose oxide 
                 15 
               
               
                   
                 Phenethylol 
                 200 
               
               
                   
                 Phenylhexanol 
                 100 
               
               
                   
                 Polysantol ® 6)   
                 100 
               
               
                   
                 9-Decen-1-ol 
                 25 
               
               
                   
                 Terpineol 
                 70 
               
               
                   
                 Vert de Lilas 
                 5 
               
               
                   
                 Ionone alpha 
                 55 
               
               
                   
                 Wardia ® 7)   
                 20 
               
               
                   
                 Total 
                 2000 
               
               
                   
                   
               
               
                   
                 *in dipropylene glycol  
               
               
                   
                   1) origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   2) pentadecenolide; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   3) methyl dihydrojasmonate; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   4) 4,4A,5,9B-tetrahydro-indeno[1,2-D]-1,3-dioxine; origin:International Flavors &amp; Fragrances, USA  
               
               
                   
                   5) methylionone; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   6) 3,3-dimethyl-5-(2,2,3-trimethyl-3-cyclopenten-1-yl)-4-penten-2-ol; origin:Firmenich SA, Geneva, Switzerland  
               
               
                   
                   7) floral composition; origin:Firmenich SA, Geneva, Switzerland  
               
             
          
         
       
     
     The addition of 400 parts by weight of the compound of formula (I) imparted to this composition the woody character that was lacking and distinctly enhanced its impact on dry linen. The natural leather type connotation of the compound of the invention fits particularly well with the spicy-ylang notes of this base fragrance.