Abstract:
A process is described for preparing 4-haloalkyl-3-mercapto-substituted 2-hydroxybenzoic acid derivatives of the general formula (I) by reaction of 4-thio-substituted β-keto esters of the formula (II) with alkoxyvinyl haloalkyl ketones of the formula (III) in the presence of a base. In the above formulae, X, R1, R2 and R3 are each hydrogen, halogen, alkyl, alkoxy and cycloalkyl.
Abstract:
The present invention relates to processes for the preparation of oxindoles and ortho-substituted anilines and their use as intermediates for syntheses. The invention further relates to a process for the preparation of compounds of formula (4): where a mixture of an aniline (compound of formula Q) is reacted with a thioether (compound of formula W): in the presence of a chlorinating agent and an organic solvent at a reaction temperature in the range above −65° C.In a subsequent process, this compound is further reacted in the presence of an acid catalyst to give the indole of formula (7) or the oxindole of formula (8):
Abstract:
The present invention relates to processes for the preparation of oxindoles and ortho-substituted anilines and their use as intermediates for syntheses. The invention further relates to a process for the preparation of compounds of formula (4): where a mixture of an aniline (compound of formula Q) is reacted with a thioether (compound of formula W): in the presence of a chlorinating agent and an organic solvent at a reaction temperature in the range above −65° C. In a subsequent process, this compound is further reacted in the presence of an acid catalyst to give the indole of formula (7) or the oxindole of formula (8):