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    • 3. 发明申请
    • Process for the preparation of substituted heteroaromatics
    • 制备取代杂芳族化合物的方法
    • US20100217015A1
    • 2010-08-26
    • US12663536
    • 2008-05-27
    • Antje HieronymiLars Rodefeld
    • Antje HieronymiLars Rodefeld
    • C07D333/10
    • C07D333/08
    • 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.
    • 描述了制备通式(I)的取代杂芳族化合物的方法,其中X是氧,硫或NR 5,其中R 5是氢,C 1 -C 20 - 烷基或C 5 -C 6 - 芳基,R 4是C 1 -C 20烷基, C 2 -C 6 - 芳基或杂芳基,R 1,R 2,R 3是氢,卤素,C 1 -C 20烷基,C 5 -C 6 - 芳基或杂芳基,通过反应A)通式(II)的卤代杂芳基,其中X具有 对于式(I)和R6给出的含义是溴,碘或氯,并且R 1,R 2和R 3具有式(I)给出的含义,通式(III)的格利雅试剂R4MgHal(III)其中R4具有 式(I)给出的含义和Hal是溴,碘或氯或B)式(II)的卤化杂芳族化合物与镁的反应首先得到通式(IIIa)的格利雅化合物,其中Hal是溴, 碘或氯,X和R 1,R 2和R 3具有式(I)给出的含义,并进一步与本发明的卤代化合物反应 式(IV)R4Hal(IV)其中R4具有式(I)给出的含义,Hal是溴,碘或氯,其中反应A)或B)在每种情况下在Ni或 Pd催化剂,其特征在于该方法在环烷基烷基醚作为溶剂和任选的另外的溶剂的存在下进行。 同样地描述了在Kumada反应中使用环烷基烷基醚,特别是环戊基甲基醚来制备取代的杂芳族化合物,特别是取代的噻吩。