Glyoxylic Acid → 4-{[(4-tert-Butyl-phenyl)-carboxy-methyl]-amino}-benzoic Acid Tert-butyl Ester

Participants

Reaction Steps

In a 100 mL round bottom flask, t-butyl phenyl boronic acid (850 mg, 4.4 mmol), glyoxylic acid (404 mg, 4.4 mmol) and 4-Amino-benzoic acid tert-butyl ester (780 mg, 4.4 mmol) were dissolved in 25 mL of dichloromethane and allowed to stir at RT. After 30 min the reaction turned cloudy, but was allowed to stir an additional 2 h. Upon completion, the reaction was quenched with 20 mL water and the organic layer was separated, dried over sodium sulfate and filtered. The solvent was removed under reduced pressure to give 1.6 g (95%). of a light yellow powder. 1H NMR (CDCl3): δ 1.29 (9H, s), 1.55 (9H, s), 5.17 (1H, s), 6.57 (2H, d, J=8.4 Hz), 7.39 (4H, s), 7.78 (2H, d, J=8.4 Hz).

Provenance & Evidence