Potassium Carbonate → [4-(4-[1,2,3]Triazol-1-yl-but-1-enyl)-phenyl]-carbamic acid tert-butyl ester

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Reaction Steps

A solution of 1-but-3-ynyl-1H-[1,2,3]triazole (0.76 g, 6.3 mmol) in anhydrous THF (50 ml) is treated with 9-BBN (0.5 M in THF, 27.6 ml, 13.8 mmol) at 0° C. and stirred for 2 h. This mixture is added to a solution of (4-iodo-phenyl)-carbamic acid tert-butyl ester (2 g, 6.3 mmol), [Pd(PPh3)2]Cl2 (0.51 g, 0.63 mmol) and aqueous potassium carbonate (3M, 6.3 ml, 18.8 mmol) in N,N-dimethyl formamide (50 ml) and stirred for 2 h at 70° C. After cooling to room temperature ethyl acetate (100 ml) is added and the solution extracted with water (2×50 ml). The organic layer is concentrated and the crude product purified by flash column chromatography (ethyl acetate/heptane 3:1) and washing with diethyl ether to yield [4-(4-[1,2,3]triazol-1-yl-but-1-enyl)-phenyl]-carbamic acid tert-butyl ester as beige solid (0.65 g, 33%).

Provenance & Evidence