NEW MATERIAL:A conjugated diene shown by formula I (R1 is group shown by formula II to formula IV or formyl; R2 is CN, formyl or CO2R6; R3 to R6 are 1-4C alkyl and further R3 and R4 are bonded to form ring).
EXAMPLE: A compound shown by formula V.
USE: An intermediate capable of industrially and advantageously producing sarcophytol A having anti-carcinogenic promoter action and antitumor action from an inexpensively and readily obtainable raw material without passing through an oxidation process of terminal methyl group.
PREPARATION: A compound shown by formula VII which is obtained from a compound shown by formula IV through Wittig type reaction process or further reduction process, epoxidizing process and isomerizing process is allowed to react with a compound shown by formula VIII to give a compound shown by formula I (R1 is the group shown by formula II), which is reduced or reduced and then oxidized to give a compound shown by formula I (R1 is the group shown by formula III). Then this compound is oxidized to give a compound shown by formula I (R1=CHO), which is subjected to Wittig type reaction to give a compound shown by formula I (R1 is the group shown by formula IV).
KITANO YASUNORI
MORINAKA YASUHIRO
