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- [21] A novel synthetic method of the (±)-(3aα,8aα)-ethyl 8β-hydroxy-6β-methyl-2-oxooctahydro-2H-cyclohepta[b]furan-3α-carboxylate and its chemical transformation to (±)-(3aα,8aα)-3α,6β-dimethyl-3,3a,4,5,6,8a-hexahydro-2H-cyclohepta[b]furan-2-one, (+)- and (-)-7β-(2-acetoxy-1α-methylethyl)-4β-methyl-2-cyclohepten-1β-ol, and (+)- and (-)-7β-(2-acetoxy-1α-methylethyl)-4β-methyl-2-cyclohepten-1-one.: Possible common synthetic intermediates for pseudoguaianolides, 4,5-secopseudoguaianolides, guaianolides, 4,5-secoguaianolides, and octalactins JOURNAL OF ORGANIC CHEMISTRY, 1998, 63 (04): : 920 - 929