Sodium Iodide → (6R,7R)-7-phenylacetamido-3-[2-(3,4-diacetoxyphenyl)vinyl]ceph-3-em-4-carboxylic acid p-methoxybenzyl ester

Beteiligte Stoffe

Reaktionsschritte

To a solution (20 ml) in acetone of 2.6004 g of (6R, 7R)-7-phenylacetamido-3-chloromethylceph-3-em-4-carboxylic acid p-methoxybenzyl ester were dissolved 0.787 g of sodium iodide and 1.377 g of triphenylphosphine and the mixture was stirred for 1 hour. The reaction mixture was concentrated under a reduced pressure, and 25 ml of methylene chloride and 25 ml of water were added to the residue to form two layers. To the reaction mixture, 5.555 g of 2,3-diacetoxybenzaldehyde and 1.47 g of sodium bicarbonate were added and the mixture was stirred for 14 hours at room temperature. The resulting dichloromethane layer was separated, concentrated under a reduced pressure, and was then purified by flash column chromatography using Wako Gel C-300 (300 g, Wako Junyaku KK) (eluent, benzene:ethyl acetate=5:1). The product, (6R,7R)-7-phenylacetamido-3-[2-(3,4-diacetoxyphenyl)vinyl]ceph-3-em-4-carboxylic acid p-methoxybenzyl ester (1.570 g, cis isomer) was obtained.

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