The object of the present invention is to provide a process for preparing a 5-alken-1-yne compound efficiently at low costs and a process for preparing (2E,6Z)-2,6-nonadienal by making use of the aforesaid process for preparing the 5-alken-1-yne compound.
There is provided a process for preparing a 5-alken-1-yne compound of the following formula (4): Y—Z—CR1═CR2—(CH2)2—C≡CH (4) in which Y in formula (4) represents a hydrogen atom or a hydroxyl group, the process comprising at least steps of: subjecting (i) an alkenylmagnesium halide compound prepared from a haloalkene compound of the following formula (1): Y—Z—CR1═CR2—(CH2)2—X1 (1) and (ii) an alkyne compound of the following formula (2): X2—C≡C—Si(R3)(R4)(R5) (2) to a coupling reaction to form a silane compound of the following formula (3): Y—Z—CR1═CR2—(CH2)2—C≡C—Si(R3)(R4)(R5) (3); and subjecting the silane compound (3) to a desilylation reaction to form the 5-alken-1-yne compound (4).
本发明的目的是提供一种低成本高效率地制备 5-烯-1-炔化合物的工艺,以及利用上述制备 5-烯-1-炔化合物的工艺制备 (2E,6Z)-2,6-壬二烯醛的工艺。
本发明提供了一种制备下式(4)的 5-烯-1-炔化合物的工艺:Y-Z-CR1═CR2-(
CH2)2-C≡CH(4),其中式(4)中的Y代表氢原子或羟基,该工艺至少包括以下步骤:使(i)由下式(1)的卤代烃化合物制备的烯基卤化
镁化合物:Y-Z-CR1═CR2-( )2-X1(1)和(ii)下式(2)的
烷烃化合物:X2-C≡C-Si(R3)(R4)(R5) (2) 进行偶联反应,生成下式(3)的
硅烷化合物:Y-Z-CR1═CR2-( )2-C≡C-Si(R3)(R4)(R5) (3);将
硅烷化合物(3)进行脱
硅反应,形成 5-烯-1-炔化合物(4)。