Triethylamine → 3-((2S,3R)-4-(N-(4-Cyanobenzyl)-N-(2-(trimethylsilyl)ethoxycarbonyl)amino)-1-cyclohexyl-3-hydroxybutan-2-ylamino)-4-methoxycyclobut-3-ene-1,2-dione

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A solution of (2R,3S)-1-(N-(4-cyanobenzyl)-N-(2-(trimethylsilyl)ethoxycarbonyl)amino)-2-hydroxy-3-amino-4-cyclohexylbutane (764 mg, 1.68 mmol) in EtOH (20 mL) was treated with 3,4-dimethoxycyclobut-3-ene-1,2-dione (300 mg, 2.10 mmol, 1.25 equiv) and Et3N (212 mg, 1.25 equiv). The resulting solution was allowed to stir at rt for 17 h. The excess 3,4-dimethoxycyclobut-3-ene-1,2-dione was removed by flash chromatography on silica gel, eluting with 0-65% EtOAc in hexanes. Analysis of the compound by LC-MS showed that it was of sufficient purity to employ in the subsequent steps.

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