Method for producing substituted phenylsulfonyl urea
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United States of America Patent
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Issued Date -
Jan 5, 2006
app pub date -
Apr 16, 2003
filing date -
Apr 26, 2002
priority date (Note) -
Abandoned
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Abstract
The invention relates to a preparation process for the compound (I) or a salt thereof where Q, X*, Y, Z, R, R.sup.1, R.sup.2 and R.sup.3 are as defined in claim 1, which comprises a) monoesterifying a compound (II) where Hal=a halogen atom, giving (III), b) either b1) ammonolysing and phosgenating this compound to give (V) or b2) converting this compound with cyanate into (V) and c) converting the resulting compound (V) with the aminoheterocycle H.sub.2N-Het (Het=heterocycle as in (I)) into the compound (I) or a salt thereof. Some compounds (II) and some intermediates (VIII), stabilized with N-heteroaromatic compounds, of the compounds (V) are novel. The compounds (II) can be obtained from the corresponding sulfobenzoic acids by reaction with acid halides of sulfur or phosphorus in nonpolar organic solvents.
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