Triethylamine → HCID 67874578, compound

Participants

Reaction Steps

A mixture containing (±)-7-(1-hydroxypropyl)-8-methylindolizino[1,2-b]quinolin-9(11H)-one (61.2 mg, 0.20 mmol), 4-dimethylaminopyridine (7.4 mg, 0.06 mmol), 4-nitrophenyl 3-[[(1,1-dimethylethoxy)carbonyl]amino]propionate (248 mg, 0.80 mmol) and dry triethylamine (222 mL, 1.60 mmol) in 1,2-dichloroethane (5 mL) under an argon atmosphere was heated at reflux for 5 d. Thin layer chromatographic analysis at this time indicated that the reaction was incomplete, so the mixture was transferred to a pressure bottle and heated at 90°-95° C. for 1 d. Afterwards, additional 4-nitrophenyl 3-[[(1,1-dimethylethoxy)carbonyl]amino]propionate (248 mg, 0.80 mmol) and dry triethylamine (222 mL, 1.60 mmol) were added, and heating was continued for 13 d. The mixture was then purified by flash chromatography eluting with a solvent gradient of 0-3% MeOH/CH2Cl2. The material that was isolated was recrystallized from Et2O and dried in vacuo to afford the title compound, mp 155°-8° C. 1H NMR (CDCl3) d 8.35 (s, 1H), 8.22 (d, J=8.6 Hz, 1H), 7.91 (d, J=7.2 Hz, 1H), 7.81 (m, 1H), 7.63 (m, 1H), 7.32 (s, 1H), 5.90 (dd, J=7.7, 6.1 Hz, 1H), 5.26 (s, 2H), 5.02 (br s, 1H), 3.44 (m, 2H), 2.66 (q, J=5.8 Hz, 2H), 2.02-1.80 (m, 2H), 1.38 (s, 9H), 0.98 (t, J=7.4 Hz, 3H). Anal. Calcd for C27H31N3O5.1/5 H2O: C, 67.40; H, 6.58; N, 8.73. Found: C, 67.78; H, 6.48; N, 8.35.

Provenance & Evidence