METHOD FOR PRODUCING OPTICALLY ACTIVE 2,3-DIHYDROFARNESAL

PROBLEM TO BE SOLVED: To provide a synthetic intermediate useful for obtaining optically active 2,3-dihydrofarnesal high in chemical purity and optical purity, and a satisfactorily efficient method for producing the intermediate.SOLUTION: Provided is optically active farnesyl enamine represented by formula (4) (*denotes an asymmetric carbon atom; R1 and R2 respectively independently denote H, a substituted/unsubstituted 1-20C alkyl group, a substituted/unsubstituted 3-8 membered-ring alicyclic group, a substituted/unsubstituted 6-15C aryl group; a substituted/unsubstituted 2-15C heterocyclic group or a substituted/unsubstituted 7-12C aralkyl group; and R1 and R2 are not simultaneously H or R1 and R2 may be coupled to form a ring).SELECTED DRAWING: None 【課題】化学純度及び光学純度の高い光学活性２，３−ジヒドロファルネサールのを得るのに有用な合成中間体及び前記中間体の効率の良い製造方法の提供。【解決手段】式（４）で表される光学活性フェルネシルエナミン。（＊は不斉炭素原子；Ｒ1及びＲ2は各々独立に、Ｈ、置換／非置換のＣ１〜２０のアルキル基、置換／非置換の３〜８員環の脂環式基、置換／非置換のＣ６〜１５のアリール基、置換／非置換のＣ２〜１５の複素環基又は置換／非置換のＣ７〜１２のアラルキル基；Ｒ1及びＲ2は同時にＨではなく又はＲ1とＲ2とが結合して環を形成していてもよい）【選択図】なし