Triethylamine → HCID 53984519, compound

Participants

Reaction Steps

A mixture of [3-methoxy-4-(3-o-tolyl-ureido)-phenyl]-acetic acid (0.536 g) and 7-(2-ethoxycarbonyl-1-methyl-ethyl)-3,4-dihydro-2H-quinoxaline-1-carboxylic acid tert-butyl ester (396 mg, Reference Example 19) in tetrahydrofuran (10 ml) containing 4 Angström molecular sieves (0.5 g) was treated with triethyl amine (638 μl), O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (518 mg) and 4-dimethyl-aminopyridin (14 mg). After stirring for 5 hours further aliquots of [3-methoxy-4-(3-o-tolyl-ureido)-phenyl]-acetic acid (0.178 g) and O-(7-azabenzotriazol-1-yl)-N,N,N′,N′-tetramethyluronium hexafluorophosphate (172 mg) were added and stirring was continued for a further 18 hours. The reaction mixture was filtered through a celite and the filter pad was washed with ethyl acetate (50 ml). The combined filtrate and washings were washed three times with aqueous saturated ammonium chloride (20 ml), then dried over magnesium sulfate and then evaporated (40° C., 40 mbar). The residue (1.2 g) was submitted to chromatography (36 g silica, 0.040-0.063 mm particle size) eluting with a mixture of cyclohexane and ethyl acetate (70:30, v/v) to afford the title compound as a white powder (379 mg). TLC: RF=15/65 (cyclohexane:ethyl acetate, 1:1). 1H NMR (400 HMz, (CD3)2SO, at room temperature, we observe a mixture of rotamers): δ1.14 (t, J=7 Hz, 31); 1.24 (d, J=7 Hz, 3H); 1.48 (s, 9 H); 2.26 (s, 3H); 2.58 (d, J=7.5 Hz, 2H); 3.17 (m, 1H); 3.64 (m, 2H); from 3.75 to 3.90 (m, 7H); 4.04 (q, J=7 Hz, 2H); from 6.55 to 6.85 (very broad band, 2H); 6.96 (t, J=7.5 Hz, 1H); 7.00 (broad d, J=8 Hz, 1H); from 7.10 to 7.20 (m, 2H); 7.46 (broad band, 1H); 7.64 (broad s, 1H); 7.78 (d, J=8 Hz, 1H); 8.01 (d, J=8 Hz, 1H); 8.48 (s, 1H); 8.54 (broad s, 1H). MS (EI): 644 (M+).

Provenance & Evidence