Method for producing chiral dihydrotagetone, and its conversion to chiral 5-isobutyl-3-methyl-4,5-dihydro-2(3H)-furanone
申请人:Council of Scientific & Industrial Research
公开号:US06579992B2
公开(公告)日:2003-06-17
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 lactonization 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 flavored 5-butyl-4-methyl-4,5-dihydro-2(3H)-furanone of formula (1) is also as an analogue of coconut aldehyde (&ggr;-nonalactone, F.E.M.A. No. 2751) of formula (1b) which is responsible for flavoring a wide range of food stuffs including baked goods and confectionery.
从万寿菊的油中分离出的一种天然廉价的无环单萜酮(二氢万寿菊酮),化学式为(4),经过meta-高碘酸钾/高锰酸钾的平滑氧化,得到化学式为(3)的2,6-二甲基-4-氧代庚酸,将3还原为金属氢化物(如硼氢化钠或铝锂氢化物)提供化学式为(2)的4-羟基酸,它在酸性介质中未经分离即发生内酯化反应,形成两个手性中心的5-异丁基-3-甲基-4,5-二氢-2(3H)-呋喃酮,化学式为(1),它是威士忌呋喃酮5-丁基-4-甲基-4,5-二氢-2(3H)-呋喃酮的类似物,后者是酒类(威士忌、葡萄酒、白兰地和苏格兰威士忌)高质量的责任。此外,椰子味的5-丁基-4-甲基-4,5-二氢-2(3H)-呋喃酮,化学式为(1),也是椰子醛(&ggr;-壬内酯,F.E.M.A. No. 2751)的类似物,后者是调味各种食品,包括糕点和糖果的责任。