4-Methoxybenzylamine → N4-(3-chloro-4-(3-chlorobenzyloxy)phenyl)-N6-(4-methoxybenzyl)prido[3,4-d]pyrimidine-4,6-diamine

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Reaction Conditions

Reaction Steps

A mixture of compound 201 (2.60 g, 6.27 mmol) and 4-methoxybenzylamine (8.24 mL, 62.7 mmol) in dry DMSO (15 mL) was stirred under a nitrogen atmosphere at 71-72° C. (bath temperature) for 91 h. It was partitioned in between ethyl acetate (500 mL) and water (300 mL). The ethyl acetate layer was separated and washed further with water (3×300 mL); dried (MgSO4) and evaporated to give a crude product of N4-(3-chloro-4-(3-chlorobenzyloxy)phenyl)-N6-(4-methoxybenzyl)prido[3,4-d]pyrimidine-4,6-diamine (210). Chromatography on silica gel (ethyl acetate/petroleum ether=1:1) gave pure 210 (2.02 g, 61%) as a yellow/orange solid, mp 120-122° C.; 1H NMR δ [(CD3)2SO] 9.59 (s, 1H), 8.72 (s, 1H), 8.33 (s, 1H), 7.99 (d, J=2.4 Hz, 1H), 7.57-7.53 (m, 1H), 7.48-7.38 (m, 3H), 7.36-7.19 (m, 4H), 7.15 (br s, 1H), 6.91-6.85 (m, 2H), 5.25 (s, 1H), 4.48 (d, J=6.3 Hz, 2H, 3.71 (s, 3H). Anal. Calcd for C28H23Cl2N5O2: C, 63.16; H, 4.35; N, 13.15. Found C, 62.96; H, 4.63; N, 13.12.

Provenance & Evidence