Acknowledgment. We thank Professor M. Koreeda,University of Michigan, for helpful discussions and supplyingnatural salvinorin A (1) and Professor T. Prisinzano,University of Kansas, for providing experimental details ofpreparing deacetoxysalvinorin A (18) from salvinorin A (1).Thanks are also due to Mr. J. Sakai, Faculty of Engineering,Niigata University, for helpful discussions on structureelucidation by NMR spectroscopy. We gratefully acknowledgea Grant-in-Aid for Scientific Research on Priority Areas(17035031 for H.H. and T.S.) from The Ministry of Education,Culture, Sports, Science and Technology (MEXT). M.N.thanks JSPS for the promotion of young chemists.Supporting Information Available: Experimental procedures,spectroscopic data, and copies of 1H and 13C NMRspectra for all compounds. This material is available free ofcharge via the Internet at http://pubs.acs.org.
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