Hydrochloric Acid → N-[4-[[(2,4-Diaminopyrido[2,3-d]pyrimidin-6-yl)methyl]methylamino]benzoyl]-L-glutamic acid

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Reaction Steps

A suspension of compound II (R=H) (100 mg, 0.211 mmol) in O2 free water (5 ml) under N2 was adjusted to pH 6.4 with 1 N NaOH to give a solution which was treated with 38% HCHO (83.1 μl, 1.14 mmol) followed by NaBH3CN (19.9 mg, 0.317 mmol). The solution was maintained at pH 6.4 by gradual addition of 1 N HCl over a period of 45 minutes. The solution was stirred under N2 for 23 hours, filtered and acidified to pH 3.6 with 1 N HCl. The product was collected by filtration, washed with water at pH 3.6 and dried in vacuo (P2O5): yield 97 mg (94%), mp indefinite (softens and darkens above 217° C.); mass spectrum, m/e 454 (M+1)+ ;λmax nm (ε×10-3): 0.1 N HCl --221 (37.1), 311 (19.0); pH 7-219 (35.1), 247 (18.1), 305 (25.2); 0.1 N NaOH --249 (19.9), 305 (25.0), 355 sh (6.15); 1H-NMR (DMSO-d6, <5% w/v), δ2.00 m (CH2CH2CO), 2.28 t (CH2CO), 3.12 s (CH3), 4.32 m (CHN), 4.66 s (CH2N), 6.78 d, 7.72 d (C6H4), 8.31 d (5 --CH), 8.59 d (7 --CH).

Provenance & Evidence