Oxy-substituted-2-phenyl pyran derivatives and process for preparing same and perfumery uses thereof

Abstract: There is disclosed oxy-substituted-2-phenyl pyran derivatives of the general formula: The derivatives are useful for augmenting or enhancing the aroma of a perfume composition, cologne or perfumed article.

Description: THE INVENTION CH-A-655932 discloses 2-phenyl pyran and lower alkyl-substituted-2-phenyl pyrans for use in the preparation of alcohols The present invention provides oxy-substituted-2-phenyl pyran derivatives defined according to the structure: wherein: (i) the dashed lines in the pyran ring each represent carbon-carbon single bonds; or one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines is a carbon-carbon single bond; (ii) R₁ is hydrogen and R₂ represents methyl or ethyl; or (iii) R₁ and R₂ taken together (as represented by the moiety: represents methylene. The compounds and mixtures of compounds covered by the genus having the structure: have utilities in perfumery; that is, in augmenting or enhancing the aroma of perfume compositions, colognes and perfumed articles including solid or liquid anionic, cationic, nonionic or zwitterionic detergents, fabric softener compositions, fabric softener articles, hair preparations, cosmetic powders and perfumed polymers. The compounds defined according to the genus: are prepared by reacting isoprenol having the structure: with an aldehyde defined according to the structure: wherein: (i) R₁ represents hydrogen and R₂ represents lower alkyl; or (ii) R₁ and R₂ represented by the moiety: represents methylene according to the reaction: wherein in the pyran ring one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines is a carbon-carbon single bond. The resulting mixture of compounds defined according to the generic structure: may be fractionally distilled and utilized "as is" for their perfumery properties or the resulting compounds may be further reacted whereby the double bond in the pyran ring is reduced to a carbon-carbon single bond as according to the reaction: The reaction, to wit: is carried out using a protonic acid catalyst such as para toluene sulphonic acid or methane sulphonic acid. The reaction is carried out at reflux conditions, removing the water of reaction. The reaction is carried out using a solvent which is inert to the reaction product but which will also aid in the removal of the water of reaction. Such a solvent is toluene, for example. The reaction is carried out, preferably, at atmospheric pressure at reflux conditions. Thus, the reaction temperature depends upon the particular solvent used. When using toluene, for example, the reaction is carried out at approximately 104-115°C. At the end of the reaction after all of the water of reaction is taken off, the reaction mass is neutralized such as with sodium acetate solution or sodium bicarbonate solution. The resulting product is then fractionally distilled to yield useful organoleptically acceptable product. The mixture of compounds containing the unsaturated pyran ring defined according to the generic structure: may, if desired, be hydrogenated according to the reaction: as set forth, supra. The hydrogenation reaction is preferably carried out at a temperature in the range of from about 40°C up to about 50°C and a pressure in the range of from about 300 psig up to about 500 psig. The hydrogenation reaction is carried out in the presence of a catalyst which will reduce the pyran ring double bond but which will not reduce the unsaturation in the phenyl moiety. Thus, for example, a 5% palladium on carbon catalyst is preferable in this reaction. Furthermore, the reaction is to be carried out in an inert solvent such as isopropyl alcohol. The reaction time may vary from about one hour up to about four hours. The reaction is preferably carried out in an appropriately pressured autoclave. At the end of the reaction, the reaction mass is fractionally distilled to yield organoleptically acceptable product. Referring to the drawings in Figures 12 and 13, the invention embodied therein comprises a device for forming scented polymer pellets (e.g., polyethylene, polypropylene or mixtures such as polyepsiloncaprolactone and polyethylene or polypropylene or copolymers of polyvinyl acetate and polyethylene or the like) which comprises a vat or container into which a polymer or mixture of polymers admixed with one of the oxy-substituted-2-phenyl pyran derivatives of our invention is placed. The container is closed by an air-tight lid 228 clamped to the container by clamps 265 . A stirrer 273 traverses the lid or cover 228 in air-tight manner and is rotated in a suitable manner. The surrounding cylinder 212 having heating coils which are supplied with electrical current through cable 214 from a rheostat or control 216 is operated to maintain the temperature inside the container such that the polymer such as polyethylene in the container will be maintained at a molten or liquid state. It has been found advantageous to employ a colorless, odorless polymer such as low density polyethylene with a viscosity ranging between about 180 and about 220 centistokes and having a melting point in the neighborhood of 104°C (220°F). The heater 212 is operated to maintain the upper portion of the container within the temperature range of from 121°-177°C, (250°-350°F). An additional bottom heater 218 is regulated through a control 220 connected thereto through a connecting wire 222 to maintain the lower portion of the container within the temperature range of from 250°-350°F. In accordance with this aspect of the invention, a polymer such as polyethylene or polypropylene is added to the container and is then heated from 10 to 12 hours whereafter an aroma imparting material containing at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention or at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention per se is quickly added to the melt. The mixture containing at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention must be compatible with the polymer and forms a homogeneous liquid melt therewith. The heat resisting mixture generally containing from 10 to 40% by weight of the mixture of at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention or a mixture thereof is added to container; the mixture is stirred for a few minutes, for example, 5-15 minutes, and maintained within the temperature range as indicated previously by the heating coils 212 and 218 respectively. The controls 216 and 220 are connected through cables 224 and 226 through a suitable supply of electric current for supplying the power for heating purposes. Thereafter, the valve "V" is opened permitting the mass to flow outwardly through a conduit 232 having a multiplicity of orifices 234 adjacent the lower side thereof. The outer end of the conduit 232 is closed so that the liquid polymer and at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention or mixture containing same will continuously drop or drip through the orifices 234 downwardly from the conduit 232 . During this time, the temperature of the polymer and the perfumant mixture containing at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention in the container is accurately controlled so that a temperature in the range of from 99° up to 135°C (210° up to 275°F) will be maintained in the material exiting in the conduit 232 . The regulation of the temperature through the control 216 and the control 220 is essential in order to insure temperature balance to provide for the continuous dropping or dripping of the molten polymer and the perfumant containing at least one of the oxy-substituted-2-phenyl pyran derivatives of our invention through the orifices 234 at a rate which will insure the formation of droplets 236 which will fall downwardly onto a moving conveyor belt 238 trained to run between conveyor wheels 240 and 242 beneath the conduit 232 . When the droplets 236 fall onto the conveyor belt 238 they form pellets 244 which harden almost instantaneously and fall off the end of the conveyor 238 into a container 246 which is advantageously filled with water or some other suitable liquid to insure the rapid cooling of each of the pellets. The pellets are then collected from the container 246 and packaged for shipment. A feature of the invention is the provision for the moistening of the conveyor belt 238 to insure the rapid formation of the solid polymer-aromatizing agent containing pellets 244 without sticking to the belt. The belt 238 is advantageously of a material which will not normally stick to a melted polymer, but the moistening means 248 insures a sufficiently cold temperature of the belt surface for the adequate formation of the pellets 244 . The moistening means comprises a container 250 which is continuously fed with water to maintain a level 254 for moistening a sponge element 256 which bears against the exterior surface of the belt 238 . The following Examples I, II, III and IV set forth processes for preparing the oxy-substituted-2-phenyl pyran derivatives of our invention. Example V sets forth a method for using the oxy-substituted-2-phenyl pyran derivatives of our invention for their organoleptic properties. Unless otherwise indicated, all parts and percentages are by weight. EXAMPLE I PREPARATION OF 2-METHOXY-4-(TETRAHYDRO-4-METHYLENE-2H-PYRAN-2-YL)PHENOL AND 2-METHOXY-4-(DIHYDRO-4-METHYL-2H-PYRAN-2-YL)PHENOL Reaction : (wherein, in the pyran ring one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines is a carbon-carbon single bond). Into a 1 liter reaction vessel equipped with stirrer, reflux condenser, thermometer and Bidwell water removal apparatus is placed 260 grams of toluene and 0.25 grams of para toluene sulphonic acid. The reaction mass is heated to reflux (104°C) and over a 50 minute period a mixture of 167 grams of vanillin and 110 grams of isoprenol dissolved in 150 grams of toluene is added while removing water of reaction using the Bidwell apparatus. After 35 minutes a total of 21.6 grams of water is removed. 25 ml of 5% sodium acetate solution is added to the reaction mass. The reaction mass is then stripped of solvent and fractionally distilled yielding the following fractions: The resulting product is then redistilled on a 24'' vigreux column yielding the following fractions: Fractions 12-15 are bulked and have a spicy, rose, vanilla-like and smokey aroma profile with carnation, rose, guiacwood, balsamic, natural sweet and vanilla topnotes. Figure 1 is the GLC profile for the crude reaction product prior to distillation. The peak indicated by reference numeral 10 is the peak for the vanillin reactant having the structure: The peaks indicated by reference numerals 11 , 12 , 13 and 14 are the peaks for the compounds having the structures: and Figure 2 is the NMR spectrum for the mixture of compounds having the structures: and Figure 3 is the infra-red spectrum for the mixture of compounds having the structures: and EXAMPLE II PREPARATION OF 2-METHOXY-4-(TETRAHYDRO-4-METHYL-2H-PYRAN-2-YL) PHENOL Reaction : Into a 1 liter zipper autoclave is placed 3.0 grams of a 5% palladium on carbon catalyst; 200 grams of isopropyl alcohol; 1.0 grams of sodium carbonate and 179 grams (0.75 moles) of the mixture of compounds having the structures: and prepared according to Example I, bulked fractions 12-15. The autoclave is sealed and pressurized with hydrogen at a temperature of 40-50°C and a pressure of 350 psig for a period of three hours using up 0.7 moles of hydrogen. At the end of the three hour period, the autoclave is cooled and opened and the reaction mass is filtered. The reaction mass is then distilled yielding the following fractions: Fractions 2-12 are bulked and have a spicy, nutmeg and woody aroma profile with smokey, guiacwood and woody topnotes. Figure 4 is the GLC profile of the crude reaction product containing the compound having the structure: Figure 5 is the NMR spectrum for the compound having the structure: Figure 6 is the IR spectrum for the compound having the structure: EXAMPLE III PREPARATION OF MIXTURE OF 2-ETHOXY-4-(TETRAHYDRO-4-METHYLENE-2H-PYRAN) PHENOL AND 2-ETHOXY-4-(DIHYDRO-4-METHYL-2H-PYRAN-2-YL) PHENOL Reaction : (wherein, in the pyran ring one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines is a carbon-carbon single bond). Into a 5 liter reaction flask equipped with Bidwell water trap, stirrer, condenser, thermometer and heating mantle is placed 1200 grams of toluene and 0.75 grams of methane sulphonic acid. The reaction mass is heated to reflux and over a period of 90 minutes a mixture of 499 grams (3 moles) of ethyl vanillin and 330 grams (3.8 moles) of isoprenol in 330 grams of toluene is added to the reaction mass with stirring. The resulting product at reflux is stirred for a period of 30 minutes while refluxing. The reaction mass is then cooled at 70°C, 200 grams of a 10% aqueous sodium carbonate solution is added thereto. 57 Grams of water is taken off during the reaction. The reaction mass is then washed with two volumes of a 5% aqueous sodium chloride solution. The aqueous phase is separated from the organic phase. The organic phase is then fractionally distilled yielding the following fractions: The resulting product is then redistilled on a 24'' vigreux column yielding the following fractions: Fractions 9-13 are bulked and bulked fractions 9-13 have a vanilla, tonka absolute-like, woody, spicy and balsamic aroma profile with sweet, vanilla, balsamic and musky topnotes. Figure 7 is the NMR spectrum for the mixture of compounds having the structures: and Figure 8 is the infra-red spectrum for the mixture of compounds having the structures: and EXAMPLE IV PREPARATION OF 1,2-METHYLENEDIOXY-4-(TETRAHYDRO-4-METHYLENE-2H-PYRAN-2YL) PHENOL AND 1,2-METHYLENEDIOXY-4-(DIHYDRO-4-METHYL-2H-PYRAN-2-YL) PHENOL Reaction : (wherein, in the pyran ring one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines are carbon-carbon single bonds). Into a 5 liter reaction flask equipped with stirrer, thermometer, reflux condenser, Bidwell water collection apparatus and addition funnel is placed 0.75 grams of methane sulphonic acid and 750 grams of toluene. The reaction mass is heated to reflux and over a period of two hours, 450 grams of isoprenol, 1750 grams of toluene and 600 grams of heliotropin having the structure: is added to the reaction mass while refluxing. The reaction mass is continued to be stirred at reflux while removing water using the Bidwell apparatus for a period of six hours. 80 Grams of water is recovered. The reaction mass is then stirred for another 30 minutes and cooled. To the cooled reaction mass 200 grams of a 10% sodium carbonate solution is added. The reaction mass is then washed as follows: (i) 2 volumes of 5% sodium carbonate (250 ml); and (ii) 2 volumes of 5% aqueous sodium chloride (250 ml). The aqueous phase is separated from the organic phase and the organic phase is fractionally distilled yielding the following fractions: Fractions 3 and 4 are bulked and bulked fractions 3 and 4 have a floral, rose and spicy aroma profile with fruity, floral and rose topnotes. Figure 9 is the GLC profile for the crude reaction product prior to distillation (Conditions: 10% SE-30 column programmed at 80-220°C at 8°C per minute). The crude reaction product contains the compounds having the structures: and Figure 10 is the NMR spectrum for the compounds having the structures: and Figure 11 is the infra-red spectrum for the compounds having the structures: and EXAMPLE V EXAMPLE V - Cont'd. EXAMPLE V - Cont'd. The composition of matter containing the product of Example I adds to this herbal fragrance formulation spicy, rose, vanilla-like and smokey undertones and carnation, rose, guiacwood, balsamic, natural sweet and vanilla topnotes. Accordingly, the perfume composition of Example V(A) can be described as "herbal with spicy, rose, vanilla-like and smokey undertones and carnation, rose, guiacwood, balsamic, natural sweet and vanilla" topnotes. The composition of matter of Example II adds to the herbal fragrance spicy, nutmeg and woody undertones with smokey, guiacwood and woody topnotes. Accordingly, the perfume composition of Example V(B) can be described as "herbal with spicy, nutmeg and woody undertones and smokey, guiacwood and woody" topnotes. The composition of matter of Example III adds to the herbal fragrance vanilla, tonka absolute-like, woody, spicy and balsamic undertones and sweet, vanilla, balsamic and musky topnotes. Accordingly, the perfume composition of Example V(C) can be described as "herbal with vanilla, tonka absolute-like, woody, spicy and balsamic undertones and sweet, vanilla, balsamic and musky" topnotes. The composition of matter of Example IV adds to the herbal fragrance a floral, rose and spicy undertone profile with fruity, floral and rose topnotes. Accordingly, the perfume composition of Example V(D) can be described as "herbal with floral, rose and spicy undertones and fruity, floral and rose" topnotes. The features disclosed in the foregoing description, in the following claims and/or in the accompanying drawings may, both separately and in any combination thereof, be material for realising the invention in diverse forms thereof.

Claims: An oxy-substituted-2-phenyl pyran derivative characterized by the structure: wherein: (i) the dashed lines in the pyran ring each represent carbon-carbon single bonds; or one of the dashed lines is a carbon-carbon double bond and the other of the dashed lines is a carbon-carbon single bond; (ii) wherein R₁ is hydrogen and R₂ is methyl or ethyl; or (iii) R₁ and R₂ taken together as represented by the moiety: represent methylene A mixture of two or three substituted pyran compounds characterized by the structure: wherein, in the mixture in each of the compounds one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines are carbon-carbon single bonds. A mixture of two or three compounds defined according to the structure: wherein, in the mixture, in each of the compounds one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines are carbon-carbon single bonds. A mixture of two or three substituted pyran compounds characterized by the structure: wherein, in the mixture in each of the compounds one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines is a carbon-carbon single bond. A pyran of Claim 1 further characterized by the structure:: A process for augmenting or enhancing the aroma of a perfume composition, cologne or perfumed article comprising the step of intimately admixing with a perfume base, cologne base or a perfumed article base, an aroma augmenting or enhancing quantity of at least one oxy-substituted-2-phenyl pyran derivative characterized in that the pyran derivative is defined according to Claim 1. The use of at least one pyran derivative in perfumery, characterized in that the pyran derivative is defined according to Claim 1. The process of manufacturing a pyran defined according to Claim 1 according to the reaction: wherein a protonic acid catalyst is used under reflux conditions and the water of reaction is removed,. with the reaction being carried out using a solvent which is inert to the reaction product but which will aid in the removal of water of reaction, and carrying out fractional distillation to yield an organoleptically acceptable product. The process of Claim 8 further characterized in carrying out the reaction: wherein the hydrogenation reaction is carried out in the presence of a catalyst which will reduce the pyran ring double bond but will not. reduce the unsaturation of the phenyl moiety, the reaction being carried out in an inert solvent.

Inventors: OUWERKERK ANTON VAN, WIEGERS WILHELMUS JOHANNES, OUWERKERK, ANTON VAN, WIEGERS, WILHELMUS JOHANNES
Applicants: INT FLAVORS & FRAGRANCES INC, INTERNATIONAL FLAVORS & FRAGRANCES INC.
Application year: 1990
Main classification: C07D309
IPC codes: C07D309, C07D407, C11B9