Scheme 1.
Synthesis of the studied compounds.
Reagents and conditions: a) acetone, pyridine; b) KOH, HCl; c) KMNO4, acetone, H2O; d), SOCl2, toluene; e) H2, Ra-Ni, MeOH, THF; f) ClCO2Me, acetone, K2CO3.
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