Abstract
Bengamides are sponge-derived natural products of mixed biosynthesis (polyketides andamino acids), the first two members, isolated from Jaspidae sponges in coral surrounding Fijiislands, were reported in 1986. The main structural variation is located on the 3-aminocaprolactam moiety, and displays a wide range of biological activities, includingantitumor, antibiotic, and anthelmintic properties. These interesting biological activities havemade bengamides popular targets for synthesis and biological studies. There have been somereports on diverse modifications of the caprolactame unit, and indication that N-substitution oncaprolactam greatly influences the antitumor activity. In this paper, we reported the method forsynthesis of 6 amino lactams containing an additional N-alkyl group (4a-4c) and (8a-8c) forfurther synthesis of new bengamide analogues. Their structures were established by MS andNMR spectroscopies.
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