Stereospecific Synthesis of Selectively C-7-Acetalized Substituted 4aβ-Methyl-3,4,4a,5,6,8aα-hexahydronaphthalene-1(2H),7(8H)-diones. A Short Total Synthesis of (+/-)-β-Eudesmol, (+/-)-β-Selinene, and (+/-)-β-Dictyopterol

Article abstract of DOI:10.1021/jo00171a045

An efficient general method has been developed for the synthesis of 4aβ,8α-dimethyl-3,4,4a,5,6,8aα-hexahydronaphthalene-1(2H),7(8H)-dione 7-ethylene acetals 1 and 4aβ-methyl-3,4,4a,5,6,8aα-hexahydronaphthalene-1(2H),7(8H)-dione 7-dimethyl acetals 2, which