Reduced graphene oxide as a recyclable catalyst for dehydrogenation of hydrazo compounds
摘要:
Reduced graphene oxide served as a reusable and efficient carbocatalyst for aerobic oxidative dehydrogenation of hydrazo compounds. Azo compounds were obtained in high yields under mild reaction conditions. (C) 2014 Elsevier Ltd. All rights reserved.
Reaction of 1-(4-benzyloxyphenyl)-2-phenylhydrazine with dimethyl acetylenedicarboxylate (DMAD) gave dimethyl 5-benzyloxyindole-2,3-dicarboxylate and dimethyl indole-2,3-dicarboxylate. However, treatment of 1-(2-bromophenyl)2-phenylhydrazine with DMAD afforded dimethyl 7-bromoindole-2,3-dicarboxylate, exclusively. In a similar manner, dimethyl 7-bromo-5-methoxyindole-2,3-dicarboxylate was also obtained from 1-(2-bromo-4-methoxyphenyl)-2phenylhydrazine. The bromo group of dimethyl 7-bromoindole-2,3-dicarboxylate was converted to an 1-ethoxyvinyl or vinyl group by treatment with tributyl-(1-ethoxyvinyl)tin or tributyl(vinyl)tin in the presence of a Pd(O) catalyst.
Über Derivate des Phenylbutazons. I. In den Benzolkernen hydroxylierte Derivate
作者:R. Pfister、F. Häfliger
DOI:10.1002/hlca.19570400218
日期:——
The synthesis of four derivatives of phenylbutazone with one or two hydroxy groups in the phenyl nuclei is described, among them p-hydroxy-phenylbutazone [1-(p-hydroxyphenyl)-2-phenyl-4-n-butylpyrazolidine-3,5-dione] (II) which is one of the metabolites of phenylbutazone in man.
Reduced graphene oxide as a recyclable catalyst for dehydrogenation of hydrazo compounds
作者:Li-Sha Bai、Xiao-Min Gao、Xuan Zhang、Fei-Fei Sun、Ning Ma
DOI:10.1016/j.tetlet.2014.06.097
日期:2014.8
Reduced graphene oxide served as a reusable and efficient carbocatalyst for aerobic oxidative dehydrogenation of hydrazo compounds. Azo compounds were obtained in high yields under mild reaction conditions. (C) 2014 Elsevier Ltd. All rights reserved.