Aminobenzenesulfonamidohalopyrazines and method of preparing same
申请人:AMERICAN CYANAMID CO
公开号:US02475673A1
公开(公告)日:1949-07-12
GB612385
申请人:——
公开号:——
公开(公告)日:——
US4299962A
申请人:——
公开号:US4299962A
公开(公告)日:1981-11-10
Process for synthesizing 2-sulphanilamido-3-methoxypyrazine
申请人:Pierrel S.p.A.
公开号:US04299962A1
公开(公告)日:1981-11-10
2-Sulphanilamido-3-methoxypyrazine is produced in high purity and good yield, by reacting 2,3-dichloropyrazine with sulphanilamide in the presence of potassium carbonate, an aprotic solvent such as dimethylformamide and a second solvent such as toluene which is inert toward the reagents and is adapted to remove the water of reaction.