Diisopropylethylamine → Methyl 3-[2-(2,6-dichlorophenyl)-6-quinolinyl]-2-[(2-isopropoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]propanoate

Participants

Reaction Steps

To a solution of methyl 2-amino-3-[2-(2,6-dichlorophenyl)-6-quinolinyl]propanoate 33 (2 TFA salt, 1.51 g) in CH3OH (15 ml) cooled with an ice bath, are added 0.96 ml of DIPEA and 495.6 mg of 3,4-diisopropoxy-3-cyclobutene-1,2-dione. The solution is stirred overnight at Rt. The solution is evaporated and the resulting residue is purified over silica gel using CH2Cl2/CH3OH (99.2/0.8) as eluent to give methyl 3-[2-(2,6-dichlorophenyl)-6-quinolinyl]-2-[(2-isopropoxy-3,4-dioxo-1-cyclobuten-1-yl)amino]propanoate 116.

Provenance & Evidence