Sodium Hydroxide → HCID 68569057, compound

Participants

Reaction Steps

A solution of sodium hydroxide in methanol (65 mL, 5M, 325 mmol) is added to a solution of the pyrrolopyrimidine 28a (6.3 g, 13.1 mmol) in methanol (35 mL). After 1.5 h, MeOH is evaporated. The residue is dissolved in 2N NaOH (200 mL) and extracted with Et2O (2×30 mL). The aqueous layer is acidified to pH≈3-4 with aq. HCl (first with 12N HCl until some solid has precipitated, then with 2N HCl until pH 3-4 is reached and no more solid precipitates). The beige solid is filtered off and dried, giving 4.345 g (12.8 mmol, 98% yield) of 30a. LC/MS analysis of this material: 95% of 30a, 3% of desacetyl-30a. This material is used without further purification. 1H-NMR (D6-DMSO): δ=1.81 (s, 3H), 3.3 (m, 2H; hidden under water peak), 3.62 (m, 2H), 7.29 (s, 1H), 7.44-7.50 (m, 3H), 8.0-8.1 (brm, 2H, NH), 8.40-8.45 (m, 2H). 1H NMR (CDCl3/CD3OD, 200 MHz): δ=1.82 (s, 3H), 3.53 (mc, 2H), 3.87 (t, J=5.7 Hz, 2H), 7.24 (s, 1H), 7.44-7.50 (m, 3H), 8.33-8.40 (m, 2H). 13C NMR (d6-DMSO, 50.3 MHz, DEPT135): δ=22.66 (+), 38.45 (−), 39.53 (−), 102.22 (Cquart), 106.11 (Cquart), 124.94 (+), 127.65 (+, 2C), 128.09 (+, 2C), 129.53 (Cquart), 138.98 (+), 152.02 (Cquart), 157.15 (Cquart), 159.21 (Cquart), 162.14 (Cquart), 169.47 (Cquart). MS (ES): m/z 339.9 (100) [MH+]. tR(method A)=5.0 min.

Provenance & Evidence