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■ Synthesis and Cyclization of Novel Lumazine - Enediyne Chimeras

Nakyen Choy and Keith C. Russell*

*Department of Chemistry, College of Arts of Sciences, University of Miami, 1301 Memorial Dr., Coral Gables, FL 33124-0431, U. S. A.

Abstract

Lumazine derivatives (6-8), appended with ethynyl groups in positions 7 and 8, were synthesized and examined for their ability to undergo Bergman cyclization. Oxo compound (7) was found to give good yields of Bergman cyclization products (~ 37 %), whereas the analogues (6) and (8) did not cyclize as efficiently or gave no identifiable cyclization products.