Processes for preparing 3-isopropenyl-6-heptenal compound and 6-isopropenyl-3-methyl-3,9-decadienyl carboxylate compound, process for preparing intermediate thereof, and intermediate thereof

Abstract

The present invention relates to a process for preparing a 3-isopropenyl-6-heptenal compound (4), R3 representing a hydrogen atom or a methyl group, the process comprising at least steps of subjecting a 4-methyl-3-pentenal acetal compound (1), having a leaving group X at 5-position, R1 and R2 representing, independently of each other, a monovalent hydrocarbon group having 1 to 10 carbon atoms; or R1 and R2 being bonded to each other and representing a divalent hydrocarbon group having 2 to 10 carbon atoms, X representing an acyloxy group having 1 to 10 carbon atoms including the carbon of the carbonyl group, an alkanesulfonyloxy group having 1 to 10 carbon atoms, an arenesulfonyloxy group having 6 to 20 carbon atoms, or a halogen atom, and the wavy line representing the E-form, the Z-form, or a mixture thereof, to a nucleophilic substitution reaction with a nucleophilic reagent, 3-butenyl compound (2), M representing Li, MgW1, ZnW1, Cu, CuW1, or CuLiW1, and W1 representing a halogen atom or a CH2═C(R3)CH2CH2— group, to form a 3-isopropenyl-6-heptenal acetal compound (3) and subjecting the 3-isopropenyl-6-heptenal acetal compound (3) to an acid hydrolysis reaction to form the 3-isopropenyl-6-heptenal compound (4). The present invention also relates to a process for preparing the 4-methyl-3-pentenal acetal compound (1); and a process for preparing a 6-isopropenyl-3-methyl-3,9-decadienyl carboxylate compound (6) from the 4-methyl-3-pentenal acetal compound (1).

Dependencies are inferred from the claim text.