Di-tert-butyl glutamate hydrochloride → di-tert-butyl N-(4-[2-(2,4-diaminopyrido[2,3-d]pyrimidin-6-yl)ethenyl]benzoyl)-L-glutamate

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Alternatively, 2.2 g (0.0074 mol) of di-tert-butyl L-glutamate hydrochloride were allowed to react with 1.5 g (0.0049 mol) of 2,4-diamino-6-[2-(4-carboxyphenyl)ethenyl]pyrido[2,3-d]pyrimidine, to yield di-tert-butyl N-(4-[2-(2,4-diaminopyrido[2,3-d]pyrimidin-6-yl)ethenyl]benzoyl)-L-glutamate in a yield of 1.3 g (48%), mp>300° C. NMR (CDCl3 /CD3OD) delta 1.47, 1.52 (2s, 18H), 2.0-2.6(m, 4H), 4.5-7.0(m, 1H), 6.8(br, s, 2H), 7.35, 7.78(AB q, 4H, J=9 Hz), 8.38(s, 1H), 8.5(s, 1H); IR (Nujol) 3350, 3180, 1725, 1640, 1605 cm-1. MS: Calc'd.: for C29H36N6O5 : 548. Found: m/e 548, 446, 290.

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