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. Author manuscript; available in PMC: 2011 Feb 7.
Published in final edited form as: Chembiochem. 2008 Jul 21;9(11):1735–1738. doi: 10.1002/cbic.200800231

Scheme 1.

Scheme 1

Reagents and conditions: a) N-hydroxysuccinimide, EDC, DCM, 2 h, 68 %. b) DBU, DMF, 5 min. c) HOBt, 1 min. d) 2, DiPEA, 30 min, 86 %. e) 5, 10 mol % CuSO4, 20 mol % sodium ascorbate, tBuOH/H2O 1:1, RT, 15 h, quant.