Sodium ethoxide → HCID 11676135, compound

Participants

Reaction Steps

A mixture of 3-(dimethylamino)-1-[6-(2-chlorophenyl)imidazo[2,1-b][1,3]oxazol-5-yl]prop-2-en-1-one (316 mg, 1.0 mmol) and (R)—N-1-azabicyclo[2.2.2]oct-3-ylguanidine hydrochloride (427 mg, 2.0 mmol) is diluted with 5 ml of absolute ethanol and treated with 1.8 eq. of a 21% w/w solution of sodium ethoxide in ethanol (0.6 ml) to form a reaction mixture. The reaction mixture is heated to reflux for 24 hours. Volatiles are removed in vacuo and the residue is taken up in 12 ml of a 5:1 mixture of ethyl acetate and methanol, washed twice with 5 ml each of water, and then with a saturated sodium chloride solution (5 ml). The organic phase is dried with magnesium sulfate, filtered and concentrated in vacuo, to give a brown oil. The product is purified by flash chromatography on silica gel (ethyl acetate/methanol/ammonium hydroxide solution, 20:4:1) to yield 329 mg of a pale yellow solid (78%). M.p.=132-134° C.; 300 MHz 1H NMR (DMSO-d6) δ: 8.91 (s, 1H), 8.25 (s, 1H), 8.03 (d, J=5.1 Hz, 1H), 7.63-7.45 (m, 4H), 7.38 (d, J=6.9 Hz, 1H), 5.80 (br. s, 1H), 3.87 (m, 1H), 3.16 (br. s, 1H), 2.86 (m, 1H), 2.8-2.4 (m, 4H), 1.92 (br. s, 1H), 1.83 (br. s, 1H), 1.59 (m, 2H), 1.32 (br. s, 1H). LCMS: 421 [M+H]; calc. for C22H21ClN6O 0.1 EtOAc 0.75 H2O: C, 60.70; H, 5.30; N, 18.98; found. C, 61.17; H, 5.21; N, 18.68.

Provenance & Evidence