Diisopropylethylamine → HCID 178419543, compound

Participants

Reaction Steps

1 g (2.19 mmol) of H-L-Arg-pNA.2HBr is dissolved in 10 ml of DMF, and 0.854 ml (6.57 mmol) of DIEA is then added. In another vessel, a solution of 4.71 mg (2.19 mmol) of Boc-L-Pro-OH in 50 ml of DMF is neutralized with 0.285 ml of DIEA. The two solutions are mixed and 970 mg of Bop are then added while the resulting mixture is kept at RT, with stirring, the pH being kept at between 7.0 and 8.0 throughout the reaction by the addition of small portions of DIEA. After one hour, the reaction is complete and the reaction mixture is evaporated to dryness under vacuum; the evaporation residue is taken up with an AcOEt/MeOH mixture and extracted with a 0.5 M aqueous solution of NaHCO3. The organic phase is dried over sodium sulfate, concentrated and precipitated in ether (MeOMe or EtOEt) to give 877 mg (yield: 70%) of the expected product.

Provenance & Evidence