Synthetic Studies on Manzamine A: Construction of the Tetracyclic ABCE Ring Substructure.-A completely different route to the tetracyclic ABCE ring substructure (V) of manzamine A is described. Beginning with an advanced intermediate (I) the procedure is characterized by the formation of the A ring in the final step. -(LI, S.; YAMAMURA, S.; HOSOMI, H.; OHBA, S.; Tetrahedron Lett. 39 (1998Lett. 39 ( ) 17, 2601Lett. 39 ( -2604 Dep.
Synthetic Studies on Manzamine A: Construction of the Tricyclic ABC Ring Subunit I. -Starting from the cyclopentanone derivative (I), a multistep synthesis of the compound (V) representing the tricyclic ABC ring subunit of manzamine A is reported. -(LI, S.; OHBA, S.; KOSEMURA, S.; YAMAMURA, S.; Tetrahedron Lett. 37 (1996) 41, 7365-7368; Dep. Chem., Fac. Sci. Technol., Keio Univ., Hiyoshi, Yokohama 223, Japan; EN)
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