A short synthesis of an enantiomerically pure des-AB-trienic steroid 11 has been achieved by thermolysis of the optically active alkenic benzocyclobutene 9 obtained by selective nucleophilic addition of an isopropenyl group to the chiral epoxide 5 as a key step.
H. Nemoto, A. Satoh and K. Fukumoto, J. Chem. Soc., Perkin Trans. 1, 1993, 2237 DOI: 10.1039/P19930002237
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