Oxalate → HCID 11765114, compound

Participants

Reaction Steps

A solution of 0.6 g of sodium cyanoborohydride in 50 ml of ethanol is added dropwise to a stirred mixture of 2 g of N-(L-alanyl)-N-(2-indanyl)glycine tert-butyl ester.oxalate, 0.78 g of sodium acetate, 0.58 g of acetic acid, 10 g of molecular sieves 3 A, 3.6 g of ethyl 6-(1-benzyloxycarbonyl-4-piperidyl)-2-oxohexanoate and 50 ml of ethanol at room temperature over a period of 3 hours. The reaction solution is allowed to stand overnight and filtered, and the filtrate is concentrated under reduced pressure. The residue is diluted with 50 ml of water and extracted with 200 ml of ethyl acetate. The extract is dried and concentrated under reduced pressure. The resulting oily material is separated and purified by silica gel column chromatography (hexane:ethyl acetate=1:1 to 2:3), whereby the first fraction yields 0.35 g of N-[N-[(R)-5-(1-benzyloxycarbonyl-4-piperidyl)-1-ethoxycarbonylpentyl]-L-alanyl]-N-(indan-2-yl)glycine tert-butyl ester as a colorless oil.

Provenance & Evidence