1,2-Dichloroethane → {2-(4-Hydroxy-phenyl)-1-[1-methylcarbamoyl-2-(4-nitro-phenyl)-ethylcarbamoyl]-ethyl} carbamic acid tert-butyl ester

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Reaction Steps

H-L-Phe(4-NO2)-NMe (200 mg, 0.770 mmol) is dissolved in 1 mL DMF. Diisopropylethylamine (209 mg, 1.62 mmol), EDC (162 mg, 0.847 mmol), HOBt.H2O (130 mg, 0.847 mmol), and Boc-Tyr (238 mg, 0.847 mmol) are added and the mixture is stirred for 18 hr. at 20 ° C. The mixture is partitioned between water and EtOAc (2×60 mL). The organics are combined and washed with brine, dried over MgSO4, filtered and evaporated to give crude product. Purification by flash chromatography, which is eluted with 97:3 DCM:methanol to give pure white solid.

Provenance & Evidence