| 摘要 |
<p>The present invention discloses 7,7-dimethylnorbor- nane derivatives useful as intermediates for the production of various synthetic perfumes and high intensity sweeteners. 2R-exo-7,7-Dimethylnorbornyl acetaldehyde, 3-(2R-exo-7,7-dimethylnorbornyl)-2-amino- propionitrile,3-(2R-exo-7,7-dimethylnorbornyl)alanine hydantoin and N-acyl-3-(2R-exo-7,7-dimethylnorbornyl) alanines are disclosed. The present invention describes a process for making 7,7-dimethylnorbornane derivatives, 3-(2R-exo-7,7-dimethylnorbornyl)-L-alanine lower alkyl esters and alpha-L-aspartyl-3-(2R-exo-7,7-dimethylnorbornyl)-L-alanine lower alkyl esters. A process for making alpha-fenchene, a process for making alpha-fenchyl alcohol and a process for making an optically active 3-(2R-exo-7,7-dimethylnorbornyl)-L-alanine or its lower alkyl ester are also disclosed. Dehydration and rearrangement catalysts are also disclosed.</p> |
