A modified Bamford–Stevens reaction on the tosylhydrazone derivative of 7-ketocholest-5-ene-3β,19-diol diacetate afforded the ring B-diene which upon photolysis and thermal isomerization yielded the vitamin analogue.
R. M. Moriarty, H. Paaren and J. Gilmore, J. Chem. Soc., Chem. Commun., 1974, 927 DOI: 10.1039/C39740000927
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