Ethyl formate → 3,3-Diphenyl-2-(1-methyl-1H-tetrazol-5-yl)propenal

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A solution of 2,2-diphenyl-1-(1-methyl-1H-tetrazol-5-yl)-ethene (3.75 g; 14.29 mmole) in dry THF (40 mL) was cooled to -78° C. and treated with n-butyllithium (6.3 mL of a 2.5 M soln. in hexane; 15.75 mmole) and the resulting mixture stirred at -78° C. for 30 minutes. Ethyl formate (1.5 mL; 18.58 mmole) was added and the mixture stirred at -78° C. for 2 hours. The reaction was quenched with 2N HCl and the solvent removed by evaporation. The residue was extracted with EtOAc (3×30 mL) and the combined organic layers were dried (MgSO4) and evaporated. The residue was purified by chromatography using 25-35% EtOAc-hexane as eluent to afford starting material (1.35 g; 36%) and the desired title compound (1.65 g; 39%); m.p.=185°-186° C. (crystallized EtOAc-hexane). MS (EI): m/e=290 for M+ ;

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