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Dithiodiketopiperazines are complex polycyclic natural products possessing a variety of interesting biological activities. Despite their interest, relatively few total syntheses have been completed. We herein report the enantioselective, scalable, and divergent total synthesis of two symmetrical pentacyclic dithiodiketopiperazines, (-)-epicoccin G and (-)-rostratin A. A common intermediate was synthesized on a multigram scale from inexpensive, commercially available starting materials using an enantioselective organocatalytic epoxidation and a double C(sp 3 )-H activation as key steps, with the latter allowing the efficient simultaneous construction of the two five-membered rings. In addition to the cis,cis -fused target (-)-epiccocin G, the more challenging (-)-rostratin A, possessing two rans ring junctions, was obtained for the first time on a 500 mg scale through the optimization of each step and validation on multigram quantities. Both natural products were synthesized with high overall yields (13-20%). This study should facilitate access to this fascinating and yet understudied family of biologically active natural products.

Efficient and Divergent Total Synthesis of (−)-Epicoccin G and (−)-Rostratin A Enabled by Double C(sp3)–H Activation

Efficient and Divergent Total Synthesis of (−)-Epicoccin G and (−)-Rostratin A Enabled by Double C(sp³)–H Activation