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. Author manuscript; available in PMC: 2010 Apr 21.
Published in final edited form as: Acc Chem Res. 2009 Apr 21;42(4):530–541. doi: 10.1021/ar800182r

Scheme 8.

Scheme 8

The discovery of an alcohol-directed gem-dihalogenation, strategic masking of functionality in a unique orthoamide steroid skeleton, and late-stage chemoselective reduction enable the synthesis of cortistatin A (16)