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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: Bioorg Med Chem. 2019 Mar 8;27(9):1776–1788. doi: 10.1016/j.bmc.2019.03.019

Scheme 2.

Scheme 2.

Reaction scheme and structures of compounds 18 through 29c; (a): SmI2, TEA, H2O, THF; (b): K2CO3, DMF, 18h, RT (c): NaH, DMF, 0°C, 30 min, then R-X, 18h, RT; (d): DMANE, TFA, DCM; (e): LAH, THF.