TY - STAND N1 - A mixture of azide 1 (4.85 mg, 6.9 μmol), peptide 5 (6.3 mg, 9.0 μmol), CuI·P(OEt)3 (16.1 mg, 45.1 μmol), and i-Pr2NEt (15.5 μL, 89.3 μmol) in DMF (2.32 mL, degassed with N2) was allowed to stand at r.t. under a N2 atmosphere. After 30 min, no further change was observed by RP HPLC using a Vydac diphenyl 10μ 300 Å 10 × 250 mm analytical column with a 0.5 mL/min flow rate. A gradient of 10% B to 100% B over 20 min was used: buffer A = 0.1% aq TFA; buffer B = MeCN + 0.1% TFA ER -