Sulfuric Acid → HCID 14387464, compound

Participants

Reaction Steps

To the m-phenoxybenzyl ester of valine (2 g, 0.0067 mole) in methanol (30 ml) is added concentrated sulfuric acid to bring to about pH 6. Cyclohexanone (0.6 g, 0.006 mole) is then added followed by 3A molecular sieves and sodium cyanoborohydride (0.25 g, 0.004 mole). Additional sulfuric acid is added to keep pH at about 6. After about 24 hours, the reaction is worked up by removing methanol by rotoevaporation and the residue is poured into water and 10% sodium carbonate followed by extraction with ether. The combined ether extracts are filtered and concentrated and the product is isolated by preparatory TLC (10% ether/hexane) to yield the m-phenoxybenzyl ester of N-cyclohexylvaline.

Provenance & Evidence