Several methods for the conversion of virescenol B tosylate (1c) into the oxetane (2) are described. On exposure to triphenyldi-iodophosphorane, (2) was transformed into the iodohydrin (1g), whose lithium–ammonia reduction led to the known isopimara-7,15-dien-19-ol (1b).
P. Ceccherelli, M. Curini and M. C. Marcotullio, J. Chem. Soc., Perkin Trans. 1, 1985, 2173 DOI: 10.1039/P19850002173
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