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. Author manuscript; available in PMC: 2019 Dec 15.
Published in final edited form as: Bioorg Med Chem Lett. 2018 Oct 25;28(23-24):3648–3651. doi: 10.1016/j.bmcl.2018.10.039

Scheme 1.

Scheme 1.

Reagents and conditions: (a) 1-2 M NaOH/CH3CN, 0 °C to rt, 12 h, then pH to 3 with aq. HC1; (b) DIPEA, CH2C12, 0 °C to rt, 12 h, then aq. HC1.