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. Author manuscript; available in PMC: 2019 Jan 1.
Published in final edited form as: Nat Chem. 2017 Sep 25;10(1):70–77. doi: 10.1038/nchem.2865

Figure 2.

Figure 2

Retrosynthetic strategy for a convergent, flexible, and enantiospecific synthesis of partially aromatic (C19-nor) steroids by metallacycle-mediated annulative cross-coupling and late-stage formation of the steroidal B-ring.