Concise total synthesis and stereochemical revision of (+)-naseseazines A and B: regioselective arylative dimerization of diketopiperazine alkaloids.

Concise and enantioselective total syntheses of (+)-naseseazines A and B are described. Our regioselective and directed dimerization of diketopiperazines provides their critical C3-C(sp(2)) linkages, an assembly with plausible biogenetic relevance. We revise the absolute stereochemistry of (+)-naseseazines A and B.