[EN] METHOD FOR THE PREPARATION OF FUNCTIONALIZED TRIHALOMETHOXY SUBSTITUTED PYRIDINES<br/>[FR] PROCÉDÉ DE PRÉPARATION DE PYRIDINES SUBSTITUÉES PAR UN RÉSIDU TRIHALOGÉNOMÉTHOXY FONCTIONNALISÉES
申请人:BAYER CROPSCIENCE AG
公开号:WO2010040461A1
公开(公告)日:2010-04-15
The present invention pertains to a process for the preparation of functionalized trihalomethoxypyridines of formula (I) comprising reacting hydroxypyridines with thiophosgene in the presence of a base; reacting the obtained chlorothionoformiates with elemental chlorine and finally converting trichloromethoxy pyridines to trihalomethoxy pyridines using a fluoride source.
the synthesis of ortho‐N‐heteroaromatic trifluoromethoxy derivatives by site‐specific O−CF3 bond formation using hydroxylated N‐heterocycles and Togni's reagent is described. The approach enables the unprecedented syntheses of a wide range of six or five‐membered N‐heteroaromatic trifluoromethoxy compounds containing one or two heteroatoms from most commonly used hydroxylated N‐heterocycles. Notable