To a solution of 1.2 g (3 mM) of 2-methoxy-3-octadecylcarbamoyloxypropylamine IV a1 (described in JP Kokai No. 60-243047) in 24 ml of dichloromethane and 0.54 ml (3.9 mM) of triethylamine is added 0.401 ml (3.3 mM) of 3-chloropropanesulfonyl chloride with ice-cooling and the mixture is stirred at room temperature overnight. The product is isolated by dichloromethane extraction and dichloromethane layer is washed with saturated aqueous sodium hydrogencarbonate and saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, and evaporated. The residue is purified by the column chromatography on silica gel with a n-hexane-ethyl acetate (3:2) mixture as an eluent. The product is recrystallized from chloroform-n-hexane mixture to give 1.386 g (2.56 mM) of 3-(3-chloropropylsulfonylamino)-2-methoxy-1-octadecylcarbamoyloxypropane III a1 as colorless crystals in 85% yield.
