2-alkoxy-5-chloro-benzenesulfonates useful for the preparation of 2-alkoxybenzosulfonamides
First Claim
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1. A 2-alkoxy-5-chlorobenzosulfonic acid alkali metal salt of formula V ##STR10## wherein R is chloromethyl, methoxymethyl, C1 -C4 alkyl or trifluoromethyl and M is a sodium or potassium atom.
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Abstract
In accordance with a novel process, 2-alkoxybenzosulfonamides of formula I ##STR1## wherein R is chloromethyl, methoxymethyl, C1 -C4 alkyl or trifluoromethyl, are prepared by reacting a 4-alkoxychlorobenzene of formula II ##STR2## with chlorosulfonic acid ClSO3 H, converting the resultant sulfonyl chloride of formula III ##STR3## by reaction with ammonia into the sulfonamide of formula IV ##STR4## and hydrogenating said sulfonamide with hydrogen, in the presence of a precious metal catalyst.
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7 Claims
- 1. A 2-alkoxy-5-chlorobenzosulfonic acid alkali metal salt of formula V ##STR10## wherein R is chloromethyl, methoxymethyl, C1 -C4 alkyl or trifluoromethyl and M is a sodium or potassium atom.
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Current AssigneeCiba-Geigy Corporation (Novartis Ag)
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Original AssigneeCiba-Geigy Corporation (Novartis Ag)
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InventorsJaeggi, Franz-Josef
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Primary Examiner(s)Chan, Nicky
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Application NumberUS07/090,261Time in Patent Office510 DaysField of Search260/512 RUS Class Current562/76CPC Class CodesC07C 309/00 Sulfonic acids; Halides, es...
