Diethyl Ether → HCID 178467627, compound

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Reaction Steps

Cuprous iodide (0.380 g) is suspended in 10 ml anhydrous ether under N2, in a dry flask and cooled to 0°. Methyl lithium (3.0 ml, 1.3 Molar) is added dropwise and the mixture is stirred at 0° for 5 min to give a yellow suspension. The mixture is then cooled to -50°. 1-(o-nitrobenzyloxycarbonyl-triphenylphosphoranylmethyl)-4-(phenylthiocarbonylmethyl)-2-azetidinone (0.674 g) in 10 ml THF is added dropwise over 5 min. The mixture is stirred at -50° for 5 min and allowed to come to -20° over 20 min and stirred at -20° for 5 min. Saturated NH4Cl solution 5 ml is added and the mixture is diluted with CH2Cl2. Stirred at r.t. for 5 min. The organic phase is separated, dried and evaporated. The residue is chromatographed on silica gel using EtOAc as eluant to give 0.162 g of the product 0.112 g of recovered thio ester.

Provenance & Evidence