2,6-Dimethoxybenzoyl chloride → (3S-trans)-3-[(2,6-dimethoxybenzoyl)amino]-4-methyl-1-[(phenylmethyl)oxy]-2-azetidinone

Beteiligte Stoffe

Reaktionsschritte

To a cold (-10° C.) solution of (3S-trans)-3-amino-4-methyl-1-(phenylmethoxy)-2-azetidinone, toluenesulfonate (0.95 g; see example 2D) in methylene chloride (50 ml) is added 2,6-dimethoxybenzoyl chloride (0.60 g) and 4-dimethylaminopyridine (0.61 g). The reaction is stirred under nitrogen and allowed to rise to 26° C. over five hours. The reaction mixture is concentrated to an oil and partitioned between ethyl acetate and aqueous hydrogen sulfate solution. The organic layer is washed with aqueous sodium bicarbonate, and brine, dried over sodium sulfate and concentrated to a foam (0.848 g).

Herkunft & Nachweise