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. Author manuscript; available in PMC: 2021 Feb 1.
Published in final edited form as: Eur J Med Chem. 2019 Nov 30;187:111925. doi: 10.1016/j.ejmech.2019.111925

Scheme 1.

Scheme 1.

Reagents and conditions: (a) anhydrous THF, 10a or 10b (1.0 eq.), 19 or 20 (1.5 eq.), DIAD (1.5 eq.), PPh3 (1.5 eq.), 0 °C to room temperature; (b) MeOH/H2O (4/1), TsOH·H2O, 20 °C; (c) AcCl, TEA, 0 °C; (d) DCM, Dess–Martin periodinane, rt.