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. Author manuscript; available in PMC: 2013 May 9.
Published in final edited form as: J Am Chem Soc. 2012 May 1;134(18):7963–7970. doi: 10.1021/ja302260d

Scheme 3. Fluorous mixture synthesis provides the penultimate precursors 15 of the final 16 stereoisomers of 1 as four mixtures of four quasiisomers.

Scheme 3

(R)/(S) represents the configuration at C13; a-d (4,5-trans series) or e-h (4,5-cis series) represents the various quasiisomers at C4/C5, and C7.