A total synthesis of (+/-)-cis-5-hydroxycalamenene 1 has been achieved from tetralone 5, which in turn was prepared from 5-methoxy-alpha-tetralone 3. Grignard reaction of compound 5 with isopropylmagnesium chloride, followed by dehydration and aromatization, provided the substituted naphthalene 7 whose conversion to (+/-)-cis-5-hydroxycalamenene 1 was accomplished by demethylation, formylation, and hydrogenation.
A total synthesis of (+/-)-cis-5-hydroxycalamenene 1 has been achieved from tetralone 5, which in turn was prepared from 5-methoxy-alpha-tetralone 3. Grignard reaction of compound 5 with isopropylmagnesium chloride, followed by dehydration and aromatization, provided the substituted naphthalene 7 whose conversion to (+/-)-cis-5-hydroxycalamenene 1 was accomplished by demethylation, formylation, and hydrogenation.