Triethylamine → HCID 178502975, compound

Participants

Reaction Conditions

Reaction Steps

40.7 μl (1.09 eq; 0.444 mmol) of dimethyl phosphite, 61.9 μl (1.09 eq; 0.444 mmol) of triethylamine and 18.8 mg (0.04 eq; 0.016 mmol) of tetrakis(triphenylphosphine)palladium(0) are stirred under an argon atmosphere for 15 minutes. 150 mg (1 eq; 0.407 mmol) of trifluoromethanesulfonic acid 3-((E)-styryl)-1H-indazol-5-yl ester in solution in 5 ml of dimethylformamide are added. The medium is heated at 85° C. overnight. 41 μl of dimethylphosphite, 62 μl of triethylamine and 20 mg of tetrakis(triphenylphosphine)palladium(0) are added to the medium, which is heated for a further two hours. 100 μl of dimethylphosphite, 100 μl of triethylamine and 30 mg of tetrakis(triphenylphosphine)palladium(0) are then added to the medium, which is heated overnight at 105° C. After filtration of the catalyst through filter paper, the solvent is evaporated off under reduced pressure in a rotary evaporator. The reaction crude is purified by LC/MS to obtain 8.6 mg of [3-((E)-styryl)-1H-indazol-5-yl]phosphonic acid dimethyl ester, along with 27.2 mg of [3-((E)-styryl)-1H-indazol-5-yl]phosphonic acid monomethyl ester (Example 13).

Provenance & Evidence