HETEROCYCLES

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■ Preparatory Study for the Synthesis of the Marine Sponge Alkaloids Asmarines A-F: Synthesis of Their Heterocyclic Portions

Masashi Ohba* and Takahiro Tashiro

*Center for Instrumental Analysis, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-0934, Japan

Abstract

A synthesis of three tricyclic compounds (1c), (2c), and (3c), selected as models for the heterocyclic portions of the marine sponge alkaloids asmarines A—F, has been accomplished through cyclization of the 7-alkyl-6-chloropurine derivatives.