After the lactone portion of trans-whiskey lactone is hydrolyzed with potassium hydroxide, this portion is reacted with isopropyl bromide and mixed with an alkyl group, thereby obtaining isopropyl (3S,4S)-4-hydroxy-3-methyloctanoate. Then, the isopropyl (3S,4S)-4-hydroxy-3-methyloctanoate is reacted with diethyl azodicarboxylate in the presence of triphenylphosphine and azodicarboxylate, thereby obtaining isopropyl (3S,4S)-4-(3',5'-dinitrobenzoyloxy)-3-methyloctanoate. The isopropyl (3S,4S)-4-(3',5'-dinitrobenzoyloxy)-3-methyloctanoate is hydrolyzed in 2% potassium hydroxide, and as a result, cis-whiskey lactone (A) represented by the following general formula is obtained. According to this method, cis-whiskey lactone, one of the perfume components of whiskey and wine, can be produced selectively and easily. ##STR1##
在使用
氢氧化钾水解转化
威士忌内酯的部分后,将此部分与异丙基
溴反应并与烷基混合,从而获得异丙基(3S,4S)-
4-羟基-3-甲氧基
辛酸酯。然后,在
三苯基膦和
双乙酰二
肟存在下,将异丙基(3S,4S)-
4-羟基-3-甲氧基
辛酸酯与
双乙酰二
肟反应,从而获得异丙基(3S,4S)-4-(3',5'-
二硝基苯甲酰氧基)-3-甲氧基
辛酸酯。将异丙基(3S,4S)-4-(3',5'-
二硝基苯甲酰氧基)-3-甲氧基
辛酸酯在2%的
氢氧化钾中
水解,从而获得以下通式所示的顺式
威士忌内酯(A)。使用该方法可以有选择性和容易地生产威士忌和葡萄酒的
香料成分之一的顺式
威士忌内酯。##STR1##