[1] Zhang, M.; Long, K.-H.; Huang, S.-H.; Shi, K.-L.; Mak, T. C. W. J. Nat. Prod. 1992, 55, 1672. [2] (a) Zhang, J.-Z.; Xu, X.-X. Tetrahedron Lett. 1998, 39, 6525. (b) Zhang, J.-Z.; Xu, X.-X. Tetrahedron Lett. 2000, 41, 941. [3] For reviews, see: (a) Furstner, A.; Bogdanovic, B. Angew. Chem., Int. Ed. Engl. 1996, 35, 2442; (b) McMurry, J. E. Chem. Rev. 1989, 89, 1513; (c) Lenoir, D. Synthesis 1989, 883; (d) McMurry, J. E. Acc. Chem. Res. 1983, 16, 405. [4] Li, Y.-L.; Liu, Z.-S.; Lan, J.; Li, J.; Peng, L.-Z.; Li, W.-D.; Li, Y.; Tetrahedron Lett. 2000, 41, 7465. [5] In Ref. 4 the authors didn't mention any isomerization of the Δ11,(12) double bond of the α,β unsaturated ester after the macrocyclization. [6] Ando, K. J. Org. Chem. 1997, 62, 1934. [7] Kolb, H. C.; Van Nieuwenhze, M. S.; Sharpless, K. B. Chem. Rev. 1994, 94, 2483. |