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Preparation of 3; General Procedure: The azide 1 (20 mmol) was dissolved in the appropriate solvent (50 mL) and CuI (see Table 1) was added. The flask was flushed with argon and the mixture was kept under argon until the workup procedure (balloon) was followed. DIPEA (see Table 1) and the alkyne 2 (10 mmol) were added one after the other, the latter in portions under stirring. If the alkyne was a solid or a sticky liquid, the solvent quantity of 50 mL was shared for dissolving the azide and the alkyne. After a short time an exothermic reaction started and the pace of the addition of the alkyne was adjusted accordingly. Cooling by a water-bath might be advisable. After complete addition of the alkyne stirring was continued at r.t. The mixture was diluted with CHCl3 (50 mL) and filtered. The filtrate was evaporated and the residue was purified by column chromatography Kieselgel 60; MeOH-CHCl3, 1:19, If DMF was used as solvent, the reaction mix
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