sodium hydroxide; trifluoroacetic acid in dichloromethane

1.1: 0.637 g / trifluoroacetic acid / CH2Cl2 / 0.67 h / 20 °C 2.1: N-hydroxysuccinimide / dimethylformamide / 0.5 h / 20 °C 2.2: 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide hydrochloride / dimethylformamide / 3 h / 0 - 20 °C 3.1: 0.054 g / trifluoroacetic acid / CH2Cl2 / 0.67 h / 20 °C View Scheme