[EN] A METHOD FOR CONVERTING DIHYDROTAGETONE, A BIFUNCTIONAL ACYCLIC MONOTERPENE KETONE INTO 5-ISOBUTYL-3-METHYL-4,5-DIHYDRO-2(3H)-FURANONE AS A ANALOGUE OF NATURAL WHISKY LACTONE AND COCONUT ALDEHYDE<br/>[FR] PROCEDE POUR CONVERTIR DE LA DIHYDROTAGETONE, UNE CETONE DE MONOTERPENE ACYCLIQUE BIFONCTIONNELLE EN 5-ISOBUTYL-3-METHYL-4,5-DIHYDRO-2(3H)-FURANONE EN TANT QU'ANALOGUE DE LACTONE DE WHISKY NATURELLE ET D'ALDEHYDE DE NOIX DE COCO
申请人:COUNCIL SCIENT IND RES
公开号:WO2002079180A1
公开(公告)日:2002-10-10
A natural inexpensive acyclic monoterpene ketone (dihydrotagetone) of formula (4), isolated from the oil of Tagetes sp., was smoothly oxidized with meta-periodate/potassium permanganate into 2,6-dimethyl-4-oxo-heptanoic acid of formula (3), the reduction of 3 with metal hydride such as sodium borohydride or lithium aluminium hydride provided 4-hydroxyacid of formula (2) which on without isolation undergone lactonisation in acidic medium furnished two chiral centered 5-isobutyl-3-methyl-4,5-dihydro-2(3H)-furanone of formula (1) as an analogue of whisky lactone 5-butyl-4-methyl-4,5-dihydro-2(3H)-furanone of formula (1a) responsible for high quality of alcoholic beverage (whisky, wine, brandy and scotch), in addition, coconut flavoured 5-butyl-4-methyl-4,5-dihydro-2(3H)-furanone of formula (1) is also as an analogue of coconut aldehyde (g-nonalactone, F.E.M.A. No. 2751) of formula (1b) which is responsible for flavouring a wide range of food stuffs including baked goods and confectionery.