Sodium Chloride → phenylphosphonic acid 3-(1H-indol-2-yl)-1H-indazol-5-yl ester methyl ester

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Phenylphosphonic acid 3-(1H-indol-2-yl)-1H-indazol-5-yl ester methyl ester is prepared according to procedure F using 230 mg of phenyl-phosphonic acid bis-(4-nitrophenyl) ester in solution in 4 ml of dichloromethane to which is added a solution of 120 mg of 3-(1H-indol-2-yl)-1H-indazol-5-ol and 72 μl of 1,8-diazabicyclo[5.4.0]undec-7-ene in 4 ml of dichloromethane. After stirring for 2 hours at ambient temperature, the medium is treated with 4 times 50 ml of a saturated sodium bicarbonate solution, and then with 2×50 ml of a saturated sodium chloride solution. The organic phase is dried over magnesium sulfate and then concentrated to dryness to obtain 200 mg of crude phenylphosphonic acid 3-(1H-indol-2-yl)-1H-indazol-5-yl ester methyl ester.

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