Scheme 4. Synthesis of L1 (cb-te1pa-EtpPhNH2): L1.
(i) K2CO3, CH3CN, 12 h, reflux, 85%; (ii) tin chloride MeOH/HCl aq 12 M, room temperature, 12 h, 83%; and (iii) hydrochloric acid 6 M, reflux, 12 h, quant.
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