Patent ID: 8153826

Claim:
A process for producing a (±)-3a,6,6,9a-tetramethyl decahydronaphtho[2,1-b]furan-2(1H)-one represented by formula (III): comprising: cyclizing one or more compounds selected from the group consisting of: (a) a homofarnesylic acid amide represented by formula (I): wherein R 1 and R 2 are each independently an alkyl group having 1 to 4 carbon atoms; and each wavy line represents a carbon-to-carbon single bond having a cis or trans structure; (b) a monocyclohomofarnesylic acid amide represented by formula (II): wherein R 1 and R 2 and each wavy line are the same as defined above; and the dotted lines indicate that a carbon-to-carbon double bond is present at any one of the positions having a dotted line; and (c) a mixture thereof, in the presence of an acid agent, to obtain a cyclized product; and subjecting said cyclized product to hydrolysis.