L-Leucinol → HCID 178472053, compound

Participants

Reaction Steps

The crude ethyl (2Z)-2-[5-bromo-2-chloropyridin-3-yl)carbonyl]-3-ethoxyprop-2-enoate (Intermediate 13, 3.2 g) was dissolved in dichloromethane (30 mL) and (2S)-2-amino-4-methylpentan-1-ol (2.17 g, 14.7 mmol) was added. The mixture was stirred for 30 min at room temperature. Dichloromethane (70 mL) was added to the reaction mixture and the mixture was washed with water (2×100 mL). The organic layer was dried over anhydrous sodium sulphate, filtered and concentrated under reduced pressure to give a thick mass which was purified by flash column chromatography. The product was eluted with the gradient of 20% ethyl acetate/petroleum ether to afford colorless thick mass 2.5 g (80%) of ethyl (2Z)-2-[(5-bromo-2-chloropyridin-3-yl)carbonyl]-3-{[(2S)-1-hydroxy-4-methylpentan-2-yl]amino}prop-2-enoate.

Provenance & Evidence