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Reagents and conditions: (a) N-Boc-L-amino acids, DCC, DMAP, 24 h, rt; (b) Partial column chromatographic purification (ethyl acetate/hexanes, 8/5) of 3'-N-Boc-, 5'-N-Boc-, and 3',5'-di-N-Boc-amino acid esters of 1 and 10; (c) TFA:DCM, 1:1, (2–4) h, rt; (d) 1 M HCl in diethyl ether, THF, overnight, rt.
