Diisopropylethylamine → HCID 69287829, compound

Participants

Reaction Steps

The compound 5-tert-butyl-[1,3,4]thiadiazol-2-ylamine (67 mg, 0.43 mmol) was dissolved in 6 mL of 1:1 CH2Cl2/DMF. The resultant solution was charged sequentially with the lithium salt of N-[(1S,2S)-1-(benzyloxycarbonylamino-methyl)-2-hydroxy-pent-3-ynyl]-malonamic acid (151 mg, 0.43 mmol, see procedure 21a), N, N-diisopropylethylamine (0.38 mL, 2.1 mmol) and HATU (194 mg, 0.51 mmol). The mixture was stirred for 12 h at RT, concentrated in vacuo, and partitioned between EtOAc and sat. NH4Cl. The aqueous phase was extracted with EtOAc (1×). The combined organic extracts were washed with sat. NaHCO3 and brine, dried (Na2SO4), filtered, and concentrated in vacuo. The residue was purified by flash chromatography to afford {(2S,3S)-2-[2-(5-tert-butyl-[1,3,4]thiadiazol-2-ylcarbamoyl)-acetylamino]-3-hydroxy-hex-4-ynyl}-carbamic acid benzyl ester as a colorless oil (90 mg, 43% yield). MS found: (M+Na)+=510.4.

Provenance & Evidence