ZHU, YUANMING,WHITEKER, GREGORY T.,ARNDT, KIM E.,RENGA, JAMES M.,FROESE, ROBERT D.
申请号：
SG2013056049
公开号：
SG192579A1
申请日:
2012.01.24
申请国别(地区):
SG
年份:
2013
代理人:
摘要：
4-Amino-3-chloro-5-fluoro-6-(substituted)picolinates are conveniently prepared from 3,4,5,6-tetrachloropicolinonitrile by a series of steps involving fluorine exchange, amination, reaction with hydrazine, halogenation, hydrolysis and esterification, and transition metal assisted coupling.
