1,1,3,3-Tetramethylguanidine → (Z)-2-[[2-chloro-4-[[(3-hydroxybenzyl)amino]carbonyl]-6-methylbenzoyl]amino]-3-(quinolin-3-yl)propenoic acid methyl ester

Participants

Reaction Steps

1,1,3,3-Tetramethylguanidine (30 μL, 0.24 mmol) was added to a solution of rac.-N-[2-chloro-4-[[(3-hydroxybenzyl)amino]carbonyl]-6-methylbenzoyl]-2-(dimethoxyphosphinyl)glycine methyl ester (Example 132; 55 mg, 0.11 mmol) in tetrahydrofuran (2 mL) at room temperature. After 5 min, quinoline-3-carboxaldehyde (18 mg, 0.114 mmol) was added and the solution was stirred at room temperature for 16 h. The reaction mixture was evaporated to dryness and the residue was dissolved in a solvent mixture of chloroform/methanol/water/acetic acid (150:30:10:6) and evaporated to dryness. A solution of the residue in a minimum amount of chloroform/methanol/water/acetic acid (150:30:10:6) was applied to a column of three piggy-backed SepPak Plus® silica gel cartridges that had been pre-washed with chloroform. The column was eluted with chloroform, then with a mixture of chloroform/methanol/water/acetic acid (300:30:10:6). Evaporation of the appropriate fractions gave (Z)-2-[[2-chloro-4-[[(3-hydroxybenzyl)amino]carbonyl]-6-methylbenzoyl]amino]-3-(quinolin-3-yl)propenoic acid methyl ester (32.7 mg, 55% yield) as a colorless powder.

Provenance & Evidence