Acetic Acid → N-{4-[2-(4-Amino-2-imino-2,3-dihydropyrido[2,3-d]pyrimidin-6-yl)ethyl]benzoyl}glutamic acid

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Reaction Steps

A solution of 0.38 g of diethyl N-(4-[2-(2,4-diaminopyrido[2,3-d]pyrimidin-6-yl)ethyl]benzoyl)-L-glutamate in 50 mL of methanol containing 4.6 mL of 0.5N aqueous sodium hydroxide was stirred at room temperature for 72 hours. Acetic acid (5 mL) was added, and the resulting white precipitate collected by filtration. The filter cake was washed well with water, methanol, and ether and was dried under reduced pressure to yield 0.15 g (44%) of the title compound, which can be alternatively named as 5,10-dideazaaminopterin; mp >250° C.; NMR (TFA-d1) delta 2.2-2.7 (m, 2H), 2.28; 2.7-2.95 (m, 2H), 5.0-5.2 (m, 1H), 7.35 and 7.85 (AB q, 4H, J=9 Hz), 8.7 (s, 1H), 9.1 (s, 1H).

Provenance & Evidence