To our shock, this reaction was very clean and afforded ketone 38 in 95 % yield. 99Compounds 42 a,b and 43 a,b bearing exam help trisubstituted olefin at C13 were synthesized in an identical way as compounds 32 a,b and 34 a,b as formerly defined, then subjected examination the Grubbs 2 precatalyst in toluene at reflux Scheme 10. 13 We were disappointed exam discover that carbonate 42 exam help and benzoate 43 a, possessing the undesired configurations at C1 and C2, provided the bicyclic compounds 33 exam help and 35 exam help that we had already accompanied for the metathesis reactions of 32 exam help and 34 exam help Scheme 8. Taxol‐like benzoate 43 b also underwent diene RCM examination produce 35 b. However, Taxol‐like carbonate 42 b supplied compound 44 after RCDEYM, which corresponds examination the tricyclic core of Taxol, together with the undesired bicyclic compound 33 b. In order examination confirm the structure of the particularly strained tricyclic product 44, we converted it exam the crystalline p‐nitrobenzoate by-product 45 by hydrolysis of the carbonate and acylation of the ensuing secondary alcohol Scheme 11.
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