摘要:
A process is described for the preparation of substituted heteroaromatics of the general formula (I) where X is oxygen, sulphur or NR5 where R5 is hydrogen, C1-C20-alkyl or C5-C6-aryl and R4 is C1-C20-alkyl, C5-C6-aryl or heteroaryl, R1, R2, R3 is hydrogen, halogen, C1-C20-alkyl, C5-C6-aryl or heteroaryl, by reaction A) of a halogenated heteroaromatic of the general formula (II) where X has the meaning given for formula (I) and R6 is bromine, iodine or chlorine and R1, R2 and R3 have the meaning given for formula (I), with a Grignard reagent of the general formula (III) R4MgHal (III) where R4 has the meaning given for formula (I) and Hal is bromine, iodine or chlorine or B) reaction of the halogenated heteroaromatics of the formula (II) with magnesium firstly to give a Grignard compound of the general formula (IIIa) where Hal is bromine, iodine or chlorine and X and R1, R2 and R3 have the meaning given for formula (I), and further reaction with a halogenated compound of the general formula (IV) R4Hal (IV) where R4 has the meaning given for formula (I) and Hal is bromine, iodine or chlorine, where the reactions A) or B) are in each case carried out in the presence of an Ni or Pd catalyst, characterized in that the process is carried out in the presence of cycloalkyl alkyl ether as solvent and optionally a further solvent. Likewise described is the use of cycloalkyl alkyl ethers, in particular cyclopentyl methyl ether, in the Kumada reaction for the preparation of substituted heteroaromatics, in particular substituted thiophenes.
摘要:
A process is described for the preparation of substituted heteroaromatics of the general formula (I) where X is oxygen, sulphur or NR5 where R5 is hydrogen, C1-C20-alkyl or C5-C6-aryl and R4 is C1-C20-alkyl, C5-C6-aryl or heteroaryl, R1, R2, R3 is hydrogen, halogen, C1-C20-alkyl, C5-C6-aryl or heteroaryl, by reaction A) of a halogenated heteroaromatic of the general formula (II) where X has the meaning given for formula (I) and R6 is bromine, iodine or chlorine and R1, R2 and R3 have the meaning given for formula (I), with a Grignard reagent of the general formula (III) R4MgHal (III) where R4 has the meaning given for formula (I) and Hal is bromine, iodine or chlorine or B) reaction of the halogenated heteroaromatics of the formula (II) with magnesium firstly to give a Grignard compound of the general formula (IIIa) where Hal is bromine, iodine or chlorine and X and R1, R2 and R3 have the meaning given for formula (I), and further reaction with a halogenated compound of the general formula (IV) R4Hal (IV) where R4 has the meaning given for formula (I) and Hal is bromine, iodine or chlorine, where the reactions A) or B) are in each case carried out in the presence of an Ni or Pd catalyst, characterized in that the process is carried out in the presence of cycloalkyl alkyl ether as solvent and optionally a further solvent. Likewise described is the use of cycloalkyl alkyl ethers, in particular cyclopentyl methyl ether, in the Kumada reaction for the preparation of substituted heteroaromatics, in particular substituted thiophenes.
摘要:
What is described is a process for preparing compounds of the general formula (I) in which R1, R2 and R3 independently of one another represent hydrogen, an alkyl group or an aryl group, wherein compounds of the general formula (II) in which R1 and R2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R3X (III) in which X represents a halogen atom and R3 has the meaning given for formula (I), if appropriate in a solvent.
摘要:
What is described is a process for preparing compounds of the general formula (I) in which R1, R2 and R3 independently of one another represent hydrogen, an alkyl group or an aryl group, wherein compounds of the general formula (II) in which R1 and R2 have the meaning given for formula (I), are reacted with an alkylating agent of the general formula (III) R3X (III), in which X represents a halogen atom and R3 has the meaning given for formula (I), if appropriate in a solvent.
摘要:
What is described is a process for brominating alkylthiophene, in which an alkylthiophene of the general formula (I) where R is a branched or unbranched alkyl radical having 1 to 12 carbon atoms is contacted with stoichiometric amounts of HBr and H2O2, optionally in the presence of a solvent.
摘要翻译:所描述的是溴化烷基噻吩的方法,其中通式(I)的烷基噻吩(其中R是具有1至12个碳原子的支链或非支链烷基)与化学计量的HBr和H 2 O 2接触,任选地存在 的溶剂。
摘要:
What is described is a process for brominating alkylthiophene, in which an alkylthiophene of the general formula (I) where R is a branched or unbranched alkyl radical having 1 to 12 carbon atoms is contacted with stoichiometric amounts of HBr and H2O2, optionally in the presence of a solvent.
摘要翻译:所描述的是溴化烷基噻吩的方法,其中通式(I)的烷基噻吩(其中R是具有1至12个碳原子的支链或非支链烷基)与化学计量的HBr和H 2 O 2接触,任选地存在 的溶剂。