Abstract
The comparison of the biological activity in the cephalostatin and ritterazin series of marine natural products proved cephalostatin 1 to be the most active compound [1,2]. The very complex and quite unusual bis-steroidal pyrazine structure induced quite some synthetic activity in various laboratories [3±5] that culminated in a total synthesis in the group of P. Fuchs in the United States (Scheme 1) [6].
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