PREPARATION OF SULFONAMIDE HERBICIDE PROCESS INTERMEDIATES
申请人:Corteva Agriscience LLC
公开号:US20220024873A1
公开(公告)日:2022-01-27
Improved methods for preparing chemical precursors to sulfonyl chloride III, which are important intermediates in the preparation of pyroxsulam herbicide, are provided. Also provided are compounds of Formula III, Formula VII, and IV, wherein R
1
is a C
1
-C
6
alkyl, X is Cl or OH, Y is halogen, OH, or OR
2
, and R
2
is a C
1
-C
6
alkyl.
A process for preparing a halogenated aliphatic-α,β-unsaturated-β-nucleophile-functionalized carboxylate ester having the formula: R1-C(-Nu)=CH-COOR8 by reacting a nucleophile with a halogenated aliphatic-α,β-unsaturated-β halocarboxylate ester having the formula: R1-CX1=CH-COOR8, wherein R1 is selected from the group consisting of straight chain and branched halogenated C¿1?-C12 aliphatic groups; Nu is a nucleophile moiety different from X?1; X1¿ is F, Cl or Br; and R8 is selected from the group consisting of straight chain and branched C¿1?-C6 alkyl groups. Halogenated aliphatic-α,β-unsaturated-β-nucleophile-functionalized carboxylate esters, halogenated aliphatic-α,β-unsaturated-β-halocarboxylate esters, and intermediate compounds and processes in the preparation thereof are also disclosed.