the compounds of the present invention may be represented by the following structures : the isomeric forms of formula ii and formula iii may be further represented , respectively , by the following structures : the compounds of the present invention can be prepared from cashmeran ™ ( commercially available at international flavors & amp ; fragrances inc .) or its hydrogenated form according to the reaction scheme below , the details of which are specified in the examples . materials were purchased from aldrich chemical company unless noted otherwise . additionally , a cis - hexahydro - quinazoline is obtained . a tetrahydro - quinazoline from the above scheme is further treated with isopropanol ( referred to as “ ipa ” hereinafter ) and palladium on carbon ( referred to as “ pd / c ” hereinafter ) in the presence of hydrogen to provide 90 % cis - and 10 % trans - hexahydro - quinazolines . those with skill in the art will recognize that the isomeric products obtained as described above can be further separated using techniques known to those with skill in the art . suitable techniques include , for example , distillation and chromatography such as high performance liquid chromatography , referred to as hplc , particularly silica gel chromatograph , and gas chromatography trapping known as gc trapping . yet , commercial products are mostly offered as isomeric mixtures . the use of the compounds of the present invention is widely applicable in current perfumery products , including the preparation of perfumes and colognes , the perfuming of personal care products such as soaps , shower gels , and hair care products , fabric care products , air fresheners , and cosmetic preparations . the present invention can also be used to perfume cleaning agents , such as , but not limited to detergents , dishwashing materials , scrubbing compositions , window cleaners and the like . in these preparations , the compounds of the present invention can be used alone or in combination with other perfuming compositions , solvents , adjuvants and the like . the nature and variety of the other ingredients that can also be employed are known to those with skill in the art . many types of fragrances can be employed in the present invention , the only limitation being the compatibility with the other components being employed . suitable fragrances include but are not limited to fruits such as almond , apple , cherry , grape , pear , pineapple , orange , strawberry , raspberry ; musk , flower scents such as lavender - like , rose - like , iris - like , carnation - like . other pleasant scents include herbal and woodland scents derived from pine , spruce and other forest smells . fragrances may also be derived from various oils , such as essential oils , or from plant materials such as peppermint , spearmint and the like . a list of suitable fragrances is provided in u . s . pat . no . 4 , 534 , 891 , the contents of which are incorporated by reference as if set forth in its entirety . another source of suitable fragrances is found in perfumes , cosmetics and soaps , second edition , edited by w . a . poucher , 1959 . among the fragrances provided in this treatise are acacia , cassie , chypre , cyclamen , fern , gardenia , hawthorn , heliotrope , honeysuckle , hyacinth , jasmine , lilac , lily , magnolia , mimosa , narcissus , freshly - cut hay , orange blossom , orchid , reseda , sweet pea , trefle , tuberose , vanilla , violet , wallflower , and the like . the term “ improving ” in the phrase “ improving , enhancing or modifying a fragrance formulation ” is understood to mean raising the fragrance formulation to a more desirable character . the term “ enhancing ” is understood to mean making the fragrance formulation greater in effectiveness or providing the fragrance formulation with an improved character . the term “ modifying ” is understood to mean providing the fragrance formulation with a change in character . the terms “ fragrance formulation ”, “ fragrance composition ”, and “ perfume composition ” are understood to mean the same and refer to a formulation that is intended for providing a fragrance character to a perfume , a cologne , toilet water , a personal product , a fabric care product , and the like . the fragrance formulation of the present invention is a composition comprising a compound of the present invention . olfactory effective amount is understood to mean the amount of compound in perfume compositions the individual component will contribute to its particular olfactory characteristics , but the olfactory effect of the perfume composition will be the sum of the effects of each of the perfumes or fragrance ingredients . thus the compounds of the invention can be used to alter the aroma characteristics of the perfume composition , or by modifying the olfactory reaction contributed by another ingredient in the composition . the amount will vary depending on many factors including other ingredients , their relative amounts and the effect that is desired . the amount of the compounds of the present invention employed in a fragrance formulation varies from about 0 . 005 to about 70 weight percent , preferably from 0 . 005 to about 50 weight percent , more preferably from about 0 . 5 to about 25 weight percent , and even more preferably from about 1 to about 10 weight percent . those with skill in the art will be able to employ the desired amount to provide desired fragrance effect and intensity . in addition to the compounds of the present invention , other materials can also be used in conjunction with the fragrance formulation . well known materials such as surfactants , emulsifiers , polymers to encapsulate the fragrance can also be employed without departing from the scope of the present invention . when used in a fragrance formulation this ingredient provides sweet , floral , ambery , musky , woody , and powdery notes to make the fragrance formulation more desirable and noticeable , and add the perception of value . the odor qualities found in this material assist in beautifying and enhancing the finished accord as well as improving the performance of the other materials in the fragrance . the following are provided as specific embodiments of the present invention . other modifications of this invention will be readily apparent to those skilled in the art . such modifications are understood to be within the scope of this invention . as used herein all percentages are weight percent unless otherwise noted , ppm is understood to stand for parts per million , l is understood to be liter , ml is understood to be milliliter , g is understood to be gram , mol is understood to be mole , and mmhg be millimeters ( mm ) of mercury ( hg ). iff as used in the examples is understood to mean international flavors & amp ; fragrances inc ., new york , n . y ., usa . a 5 l reaction vessel was charged with cashmeran ™ ( 412 g , 2 . 0 mol , commercially available at iff ), formamidine acetate ( 1030 g , 10 . 0 mol ), and butanol ( 1 . 2 l ). the reaction mixture was heated to 118 ° c . for 4 hours and then cooled to 25 ° c . the reaction mixture was washed twice with brine ( 1 l ) and purified by vacuum distillation to afford 6 , 7 , 8 , 9 - tetrahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( 260 g ) having a boiling point of 140 ° c . at a pressure of 1 . 6 mmhg further recrystallization from ethanol afforded a solid with a melting point of 80 . 0 ° c . 1 h nmr ( cdcl 3 , 500 mhz ): 8 . 90 ppm ( s , 1h ), 8 . 31 ppm ( s , 1h ), 2 . 77 - 2 . 82 ppm ( m , 2h ), 2 . 35 - 2 . 41 ppm ( m , 1h ), 2 . 25 - 2 . 32 ppm ( m , 1h ), 1 . 74 ppm ( q , 1h , j = 7 . 37 hz ), 1 . 38 ppm ( s , 3h ), 1 . 23 ppm ( s , 3h ), 1 . 11 ppm ( s , 3h ), 0 . 95 ppm ( d , 3h , j = 7 . 40 hz ), 0 . 93 ppm ( s , 3h ). the compound was described as having musky , ambery , and powdery notes . dihydrocashmeran was obtained via the hydrogenation of cashmeran ™. a 3 l reaction vessel was charged with dihydrocashmeran ( 255 g , 1 . 2 mol ), formamidine acetate ( 642 g , 6 . 2 mol ), and butanol ( 1 . 2 l ). the reaction mixture was heated to 118 ° c . for 4 hours and then cooled to 25 ° c . the reaction mixture was washed twice with brine ( 1 l ) and purified by vacuum distillation to afford a 40 : 60 cis / trans mixture of 6 , 6a , 7 , 8 , 9 , 9a - hexahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( 200 g ) having a boiling point of 153 ° c . at a pressure of 2 . 0 mmhg the cis / trans structures were confirmed by nmr analysis by gc trapping . 1 h nmr ( cdcl 3 , 500 mhz ): 8 . 92 ppm ( s , 1h ), 8 . 37 ppm ( s , 1h ), 2 . 75 - 2 . 93 ppm ( m , 2h ), 2 . 65 ppm ( d , j = 12 . 6 hz , 1h ), 1 . 20 - 2 . 10 ppm ( m , 4h ), 1 . 32 ppm ( s , 3h ), 0 . 99 ppm ( s , 3h ), 0 . 95 ppm ( s , 3h ), 0 . 84 ppm ( d , j = 7 . 5 hz , 3h ), 0 . 71 ppm ( s , 3h ). 1 h nmr ( cdcl 3 , 500 mhz ): 8 . 96 ppm ( s , 1h ), 8 . 39 ppm ( s , 1h ), 3 . 00 ppm ( d , j = 9 . 7 hz , 1h ), 2 . 52 - 2 . 79 ppm ( m , 2h ), 1 . 25 - 2 . 15 ppm ( m , 4h ), 1 . 42 ppm ( s , 3h ), 1 . 10 ppm ( s , 3h ), 0 . 92 ppm ( s , 3h ), 0 . 84 ppm ( d , j = 7 . 3 hz , 3h ), 0 . 54 ppm ( s , 3h ). the compounds were described as having ambery , musky , and woody notes . a 500 ml zipper autoclave was charged with 6 , 7 , 8 , 9 - tetrahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( 100 g , synthesized as above in example i ), ipa ( 100 ml ), and pd / c ( 1 g ). the autoclave was sealed , purged with nitrogen , and then pressurized with hydrogen . the reaction mixture was heated to 180 ° c . for 4 hours and subsequently cooled to 25 ° c . the autoclave was vented and purged with nitrogen . the catalyst was removed by filtration through celite . a crude mass containing the major product cis - 6 , 6a , 7 , 8 , 9 , 9a - hexahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( 90 %) was obtained . the crude mass was evaluated by gas chromatography olfactometry . cis - 6 , 6a , 7 , 8 , 9 , 9a - hexahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline was described as having a musky character . in addition , the minor product in the crude mass , trans - 6 , 6a , 7 , 8 , 9 , 9a - hexahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( formula vii ) ( 10 %), was also evaluated and described as having an ambery character . the fragrance formulas exemplified as follows demonstrated that the addition of 6 , 6a , 7 , 8 , 9 , 9a - hexahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( formula iii ) containing a 40 : 60 cis / trans isomeric mixture provided a musky character to the fragrance formula . the above fragrance formulas had floral and woody characters . the addition of 6 , 6a , 7 , 8 , 9 , 9a - hexahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( formula iii ) intensified the floral and woody notes and provided a musky undertone . 6 , 7 , 8 , 9 - tetrahydro - 7 , 7 , 8 , 9 , 9 - pentamethyl - 5h - cyclopenta [ h ] quinazoline ( formula ii ) imparted diffusive floral and soft powdery characters to a fragrance formula .
the present invention relates to novel quinazoline compounds and their use in perfume compositions . the novel quinazoline compounds of the present invention are represented by the following formula : an isomer or a mixture of isomers thereof , wherein the broken line represents a single or double bond .