Dichloromethane → (2R)-2-(4-Chlorobenzenesulfonylamino)-4-methylpentanoic acid amide

Participants

Reaction Steps

The above polymer-bound D-Leu-NH2 (20 g) was treated with CH2Cl2 (150 mL), pyridine (100 mL) and 4-chlorophenylsulfonyl chloride (20.0 g, 94.8 mmol). The mixture was shaken for 24 h, drained, washed with DMF (4×200 mL), CH2Cl2 (4×200 mL) and concentrated to give polymer-bound (R)-2-(4-chlorobenzenesulfonylamino)-4-methylpentanoic acid amide as a yellow resin (22 g). The completion of the reaction and the loading of the resin (0.57 mmol/g) were determined by the treatment of 50 mg of the resin with 10% (v/v) TFA/CH2Cl2 (2 mL) to give 8.7 mg of (R)-2-(4-chlorobenzenesulfonylamino)-4-methylpentanoic acid amide.

Provenance & Evidence