1,8-Diazabicyclo(5.4.0)undec-7-ene → (E)-2-(2-(3-bromo-1-methyl-1H-1,2,4-triazol-5-yl)vinyl)-5,8-dimethyl-[1,2,4]triazolo[1,5-c]pyrimidine

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Reaction Conditions

Reaction Steps

To a solution of 3-bromo-1-methyl-1H-1,2,4-triazole-5-carbaldehyde (120 mg, 632 μmol, Eq: 1.00) in tetrahydrofuran (25 ml) were added ((5,8-dimethyl-[1,2,4]triazolo[1,5-c]pyrimidin-2-yl)methyl)triphenylphosphonium chloride (290 mg, 632 μmol, Eq: 1.00) (prepared as described in WO2011150156, pp 123-125, Expl. 24 g) and DBU (106 mg, 105 μl, 695 μmol, Eq: 1.1). The resulting solution was stirred for 18 hours at 25° C. The crude material was applied on silica gel and purified by flash chromatography over a 20 g silica gel column using ethyl acetate methanol 0-10% as eluent affording 2-[(E)-2-(5-bromo-2-methyl-2H-[1,2,4]triazol-3-yl)-vinyl]-5,8-dimethyl-[1,2,4]triazolo[1,5-c]pyrimidine (154 mg, 73%) as a white solid. MS: m/z=336.63537 (M+H+)

Provenance & Evidence