A new synthesis of 13E-ent-crotonadiol and its 13Z-isomer from 6a-acetoxy-14,15-bis-norlabd-8(17)-en13-one is described. A mixture of methyl esters of 13E- and 13Z-6a-acetoxylabd-8(17),13-dien-15-oic and 13E- and 13Z-6a-hydroxylabd-8(17),13-dien-15-oic acids was formed by its reaction with trimethylphosphonoacetate. Mixtures of 13E- and 13Z-6a-hydroxylabd-8(17),13-dien-15-oic acids were formed by hydrolysis of this mixture. These were separated, methylated, and reduced by LiAlH4 to give the pure 13E- and 13Z-crotonadiols in 64 and 16% yields, respectively. The two known syntheses of crotonadiol from (+)-larixol were reproduced. It was shown that they produced only 13E-crotonadiol.
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The authors from P. Poni Institute are grateful for support by Project No. 264115 (STREAM), which is an integral part of European Project FP7-REGPOT-2010-1.
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Translated from Khimiya Prirodnykh Soedinenii, No. 3, pp. 356–361, May–June, 2011.
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Vlad, P.F., Chokyrlan, A., D’Ambrosio, M. et al. Synthesis of ent-crotonadiol and compounds related to it from (+)-larixol. Chem Nat Compd 47, 397 (2011). https://doi.org/10.1007/s10600-011-9943-z
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DOI: https://doi.org/10.1007/s10600-011-9943-z