A variety of heterocyclic antibiotics and phytotoxins have been found to date. These compounds or their derivatives are essential for daily life as useful agrochemicals and medicines. Total and semi-synthesis of these natural products and related analogous compounds are important for the elucidation of structure-activity relationships and for further development of novel and effective agents. This chapter reviews synthetic studies of biologically active heterocyclic natural products containing nitrogen atoms in their structures, such as glutarimides, antimycins, and tabtoxins.

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