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. Author manuscript; available in PMC: 2017 Jun 1.
Published in final edited form as: Angew Chem Int Ed Engl. 2015 Mar 30;54(20):5929–5932. doi: 10.1002/anie.201412164

Scheme 1.

Scheme 1

Synthesis of SG1. Reagents and Conditions: a) TfOH, NIS, DCM, −60 °C, 2h, 75%; c) i) NaOMe, MeOH, rt, 30 min.; ii) Pd(OH)2/C/H2, EtOH, rt, 12h.; iii) 0.05 N NaOH in H2O, rt, 4h, 93% over three steps.