申请人:——
公开号:US20030216573A1
公开(公告)日:2003-11-20
The present invention provides a method of preparing 4-amino-3-alkylthio-1,2,4-triazine-5-ones of the formula (I)
1
wherein R, R
1
, R
2
and R
3
are as defined herein, the method comprising reacting in the presence of a base and under at least one condition selected from the presence of at least one inorganic compound selected from inorganic sulfites and inorganic bisulfites, an inert gas purge, and an alternating inert gas blanket and vacuum, a 4-amino-3-mercapto-1,2,4-triazin-5-one of the formula (II)
2
wherein R, R
1
and R
2
are as defined herein, with an alkylating agent of the formula R
3
-X, wherein R
3
and X are as defined herein and collecting the reaction product.
本发明提供了一种制备式(I)的4-氨基-3-烷基硫代-1,2,4-三嗪-5-酮的方法,其中R、R1、R2和R3如本文所定义,该方法包括在碱存在下,在至少选择自无机亚硫酸盐和无机亚硫酸氢盐中的至少一种条件下反应,惰性气体通气,交替惰性气体保护和真空,将式(II)的4-氨基-3-巯基-1,2,4-三嗪-5-酮与式R3-X的烷基化试剂反应,其中R、R1和R2如本文所定义,R3和X如本文所定义,并收集反应产物。