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. Author manuscript; available in PMC: 2014 Mar 11.
Published in final edited form as: ACS Comb Sci. 2013 Feb 11;15(3):147–152. doi: 10.1021/co300127z

Scheme 1.

Scheme 1

Reagents and conditions: i): phthalamide, PPh3, DIAD; ii): H2NNH2, EtOH; iii): R= a part from N-Boc amino acid: HATU, DIEA, CH3CN; R= a part from an aldehyde: MeOH, molecular sieves, 0–40°C, NaBH4; R= a part from sulfonyl chloride: DMF, CsCO3; ; iv) 50% formic acid, 70°C.