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Reagents and conditions for PNA L monomer synthesis: (A) Lawesson’s reagent, THF, 0°C-rt, overnight, 54%. (B) 4-methoxybenzyl chloride, DCM, 1 h, 72%. (C) 1 M aqLiOH, THF, 1 h, 2 M HCl, 78%. (D) Ethyl N-(2-Boc-aminoethyl)glycinate, EDC∙HCl, DIPEA, DMF, 4 h, 0°C-rt, 58%. (E) 1 M aq LiOH, THF, 1 h, 70%.
