A concise and practical route to the enantiomerically pure des-A B-trienic steroid 14 was developed by thermolysis of the optically active alkenic benzocyclobutene 13 obtained by selective nucleophilic addition of isopropenyl group to the chiral epoxide 9 as a key step.
H. Nemoto, A. Satoh and K. Fukumoto, J. Chem. Soc., Perkin Trans. 1, 1994, 943 DOI: 10.1039/P19940000943
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