Scheme 3.
Synthesis of target compound 14; (i) NaOH/MeOH/reflux 6 h, (ii) SOCl2/reflux 4 h, (iii) NaN3/acetone/stirring at R.T. 4 h, (iv) Dry toluene/reflux 1 h, (v) Dry toluene/reflux 5 h.
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