5-Bromoindole → N-(2-bromo-4-(1-methylethyl)phenyl)-N-ethyl-4-(5-indolylcarbonyl)-6-methylpyrimidinamine

Participants

Reaction Conditions

Reaction Steps

To a suspension of potassium hydride (35% in oil, 0.16 g, 1.4 mmol), washed with hexanes and decanted twice, in anhydrous ether (5 mL), cooled to 0° C. under a nitrogen atmosphere was added a solution of 5-bromoindole (0.27 g, 1.4 mmol) in anhydrous ether. After being stirred for 30 min., the reaction mixture was cooled to −78° C. and transferred via cannula to a pre-cooled (−78° C.) mixture of t-butyl lithium (1.7 M in pentane, 1.6 mL, 2.7 mmol) in dry ether (5 mL). The resulting white suspension was stirred at −78° C. for 30 min and a solution of methyl 2-(N-(2-bromo-4-(1-methylethyl)-phenyl)-N-ethylamino)-6-methyl-4-pyrimidinecarboxylate (Example 18) (0.5 g, 1.25 mmol) in anhydrous ether (5 mL) was added dropwise. After quenching the reaction mixture as in Example 87; it was extracted three times with ethyl acetate, followed by two washings of the combined organic layers with a saturated NaHCO3 solution, drying over MgSO4, filtration and concentration in vacuo to give a dark brown oil. Column chromatography (ethyl acetate: hexanes::1:4) afforded the title product, a light brown solid (140 mg, 24% yield, Rf 0.2): mp 77-79° C.; NMR (DMSO-d6, 400 MHz, 90° C.): 11.6-11.35 (br s, 1H), 8.30 (s, 1H), 7.75 (dd, 1H, J=8, 1), 7.55 (d, 1H, J=1), 7.4-7.35 (m, 2H), 7.35-7.25 (m, 2H), 6.9 (s, 1H), 6.60-6.55 (m, 1H), 4.1-3.7 (m, 2H), 2.95-2.8 (m, 1H), 2.4 (br s, 3H), 1.25-1.1 (m, 9H); Anal (C25H25BrN4O): C, 62.90; H, 5.28; N, 11.74; Br, 16.74; Found: C, 63.13; H, 5.60; N, 11.37; Br, 16.80.

Provenance & Evidence