2-Naphthalenecarboxaldehyde → (Z)-2-[[2-bromo-4-[[(3-hydroxybenzyl)amino]carbonyl]benzoyl]amino]-3-(naphthalen-2-yl)propenoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

1,1,3,3-Tetramethylguanidine (50.5 μL, 0.40 mmol) was added to a solution of rac.-N-[2-bromo-4-[[(3-hydroxybenzyl)amino]carbonyl]benzoyl]-2-(dimethoxyphosphinyl)glycine methyl ester (Example 130; 106.4 mg, 0.20 mmol) in tetrahydrofuran (1 mL) at −20° C. After 5 min, a solution of naphthalene-2-carboxaldehyde (31.4 mg, 0.20 mmol) in tetrahydrofuran (0.5 mL) was added. The solution was stirred at −20° C. for 1 h and then was stirred at room temperature for 4 h. Ethyl acetate (15 mL) was added and the solution was washed with 1N hydrochloric acid solution (10 mL) and brine (10 mL). The dried (MgSO4) organic phase was filtered, evaporated and the resulting residue was triturated with petroleum ether to furnish (Z)-2-[[2-bromo-4-[[(3-hydroxybenzyl)amino]carbonyl]benzoyl]amino]-3-(naphthalen-2-yl)propenoic acid methyl ester (88 mg, 78% yield) as a yellow solid.

Provenance & Evidence