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An-Najah National University

Pharmacy

Wednesday, November 24, 1993
The Synthesis of Novel Polycyclic Heterocyclic Ring Systems via Photocyclization. 14. 14-Methylbenzo[h]naphtho¬[1'2';4,5]thieno[2,3-c][ 1,6]naphthyridine
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Benzo[h]naphtho[1'2':4,5]thieno[2,3-c][1,6]naphthyridine, a novel polycyclic heterocyclic ring system, has been synthesized as the 14-methyl derivative 8 in four steps from known intermediates. The structure of 8 is supported by assignment of the proton and the protonated carbon atoms by 2D-nmr techniques (COSY and a carbon-hydrogen one-bond coupling experiment).

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