Synthesis of cyclic enamides by intramolecular cyclization of acetylenic amides

  • Jacobi P
  • Brielmann H
  • Hauck S
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Cyclic enamides 12 of a type useful in the synthesis of naturally occurring chlorins, isobacteriochlorins, and corrins have been prepared by a process involving Nicholas-Schreiber condensation to afford acetylenic amides 13, followed by either n-Bu4NF or LiA1(NHBn)4-catalyzed ring closure. © 1995.

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  • Peter A. Jacobi

  • Harry L. Brielmann

  • Sheila I. Hauck

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