Ammonia → 5-Chloro-9H-pyrimido[4,5-b]indole-2,4 diamine propanamide

Participants

Reaction Conditions

Reaction Steps

5 mL methanol was saturated with ammonia in the plastic container (of the sealed tube reaction apparatus), which was cooled in dry ice and acetone. 10 (200 mg, 0.6 mmol) was added to this methanol saturated with ammonia. The solution was stirred at 130° C. for 2 days. Silica gel was added to the reaction mixture and methanol was removed under reduced pressure to make a plug. The plug was transferred on top of a column packed with silica gel, ten times the weight of plug, eluted with chloroform and 1% methanol in chloroform. Fractions containing the product 10 (TLC) were pooled and evaporated to give a solid. The overall yield was 39%. TLC Rf 0.43 (chloroform-methanol 5:1), m.p. 245.2-246.3° C., 1H NMR: δ 6.15 (bs, 2H, 4-NH2, exch); 6.85 (bs, 2H, 2-NH2, exch), 7.03-7.24 (m, 3H, phenyl); 11.54 (bs, 1H, 9-NH, exch). Anal. Calculated (C10H8ClN5): C, 51.40; H, 3.38; N, 29.97; Cl, 15.17. Found: C, 51.58; H, 3.46; N, 29.86; Cl, 15.05.

Provenance & Evidence