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. Author manuscript; available in PMC: 2020 Oct 22.
Published in final edited form as: J Med Chem. 2013 Nov 5;56(21):8588–8598. doi: 10.1021/jm401040b

Scheme 1. Synthesis of Derivatives 7a–y and 8a–ya.

Scheme 1.

aReagents and conditions: (i) substituted benzyl bromide, NaH, room temp; (ii) acetone, 5 N NaOH, 50 °C; (iii) diethyl oxalate, sodium ethoxide, THFa, room temp; (iv) 1 N NaOH, 1:1 THF–methanol, room temp.