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Acknowledgements
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Brown University and a “Frontiers in Chemistry” grant from the
Department of Chemistry at Brown are gratefully acknowledged
for financial support. K. L. A was supported by an Undergradu-
ate Teaching and Research Assistantship from Brown. Dr Russell
Hopson and Dr Tun-Li Shen from the Department of Chemistry
at Brown University are gratefully acknowledged for technical
support in NMR and MS analysis. We thank Mr. Corey
Compton for assistance in characterization of synthetic
intermediates.
11 Treatment of uncyclized ester 12 with acidic resins such as Amberlite 1R-
120H 4 or Dowex 50WX8-200 mesh or with organic acids like pTsOH
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