摘要:
Process for preparing 2,2-difluorethylamine derivatives of the general formula (III) in which A is an optionally substituted heterocycle as described in the description, by reacting a 2,2-difluoroethyl-1-haloethane compound of the general formula (I) in which Hal is Cl, Br or iodine, with an amine of the general formula (II) in which A is as defined above, optionally in the presence of a base.
摘要:
Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates of the formula (I) and/or (I′) comprising the reaction of a haloacetyl chloride compound of the formula (II) with a malonic ester of the formula (III) in which Hal, R1 and R2 have the definitions stated in the application, in the presence of a suitable base and optionally in the presence of a solvent; the addition of a sufficient amount of water to the reaction mixture; and the isolation of the desired 2,4-dioxotetrahydrofuran-3-carboxylate.
摘要:
Process for the preparation of 2,2-difluoroethylamine of the formula (I) CHF2CH2NH2 (I) comprising the stages (i) and (ii): stage (i): reaction of 2,2-difluoro-1-haloethane of the general formula (II) CHF2—CH2Hal (II), with a benzylamine compound of the formula (III) in the presence of an acid scavenger, in which, in formula (II), Hal is chlorine, bromine or iodine, and, in the formulae (III), R1 is hydrogen or C1-C12-alkyl, and R2 is hydrogen, halogen, C1-C12-alkyl or C1-C6-alkoxy; stage (ii): catalytic hydrogenation of the N-benzyl-2,2-difluoroethanamine compound obtained in the stage (i) to give 2,2-difluoroethylamine of the formula (I) or a salt thereof.
摘要:
Process for preparing 2,4-dioxotetrahydrofuran-3-carboxylates of the formula (I) and/or (I′) comprising the reaction of a haloacetyl chloride compound of the formula (II) with a malonic ester of the formula (III) in which Hal, R1 and R2 have the definitions stated in the application, in the presence of a suitable base and optionally in the presence of a solvent; the addition of a sufficient amount of water to the reaction mixture; and the isolation of the desired 2,4-dioxotetrahydrofuran-3-carboxylate.
摘要:
A process for the preparation of 2,2-difluoroethylamine of the formula (I) CHF2CH2NH2 (I) comprising the stages (i) and (ii): stage (i): reaction of 2,2-difluoro-1-haloethane of the formula (II) CHF2—CH2Hal (II) in which Hal is chlorine, bromine or iodine, with prop-2-en-1-amine of the formula (III) to give N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) preferably in the presence of an acid scavenger, and stage (ii): removal of the allyl group from the N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) obtained in stage (i) to give 2,2-difluoroethylamine of the formula (I) or a salt thereof.
摘要:
The present invention relates to a simplified process for preparing pyrazolylcarboxanilides by reacting pyrazolylcarboxylic esters with anilines in the presence of a base and removing at least one reaction product.
摘要:
The present invention relates to a process for preparing substituted biphenylanilides of the formula I wherein R1 is a protected amino group which comprises reacting a compound of formula II in the presence of a base and of a palladium catalyst in a solvent, with an organoboron compound of formula (III)
摘要:
The present invention relates to a process for preparing 2,2-difluoroethylamine of the formula (I) and salts thereof, for example sulphates, hydrochlorides or acetates, which proceeds from difluoroacetonitrile.
摘要:
The present invention relates to a process for preparing 2-amino-5-cyano-N,3-dimethylbenzamide of formula (I) by reacting 2-amino-5-cyano-3-methylbenzoic esters or diesters with methylamine.
摘要:
The present invention relates to a process for preparing 2,2-difluoroethylamine of the formula (I) and salts thereof, for example sulphates, hydrochlorides or acetates, which proceeds from difluoroacetonitrile.