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By the method of Example 22A 3,4-dimethoxy-2-propyl-N,N-dimethylbenzamide (9.2 g) was aminosulfonylated with sulfur dioxide and hydroxylamine-O-sulfonic acid (5.6 g) to give 2-aminosulfonyl-4,5-dimethoxy-6-propyl-N,N-dimethylbenzamide (7.4 g, 63% yield), which was cyclized in quantititive yield to 4-propyl-5,6-dimethoxysaccharin, phenylthiomethylation of which with chloromethyl phenyl sulfide (1.42 mL) gave 2-phenylthiomethyl-4-propyl-5,6-dimethoxy-saccharin (4.07 g), reaction of part (3.59 g) of which with sulfuryl chloride (2.12 mL) gave 2-chloromethyl-4-propyl-5,6-dimethoxysaccharin, 2.84 g, 97% yield.

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