Add time:07/14/2019         Source:sciencedirect.com

Using (1S,5S)-(−)-verbenone (8b), readily obtainable from (+)-nopinone (3), as the chiral source, we have established the general method for preparation of three kinds of key intermediates, conjugate enones 9 and 10 for the syntheses of neo-trans-clerodanes and 11 for those of neo-cis-clerodanes. Starting with the compound 10, the first enantioselective syntheses of (−)-(5R,8S,9S,10R)-7-oxo-cleroda-3,13E-dien-15-oic acid (7-oxo-kolavenic acid) (1) and solidagonic acid (2) as its methyl ester (48) were achieved.

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