Chitosan Based Heterogeneous Catalyses: Chitosan-Grafted-Poly(4-Vinylpyridne) as an Efficient Catalyst for Michael Additions and Alkylpyridazinyl Carbonitrile Oxidation
作者:Khaled Khalil、Hamad Al-Matar
DOI:10.3390/molecules18055288
日期:——
be synthesized under heterogeneous conditions in presence of a potassium persulfate and sodium sulfite redox system. The synthesized graft copolymer could be utilized effectively, in the form of beads, as an efficient catalyst for Michael additions of active methylenes to functionally substituted alkenes. Moreover, methyl moiety oxidation in methyl pyridazinyl carbonitriles by H2O2 in the presence of
Condensing 1-aryl-4-methyl-1,6-dihydropyridazine-5carbonitrile with triethyl orthoformate and piperidine afforded the trans-enamine 2. This could be converted into pyrido[3,4-d]pyridazine 3 upon treatment with primary aromatic amines. Reacting 2 with hydrazonoyl chlorides 5 afforded 7 rather than 6. Compound 2 gives also pyrido[3,4-d]pyridazine 10 upon treatment with acetic acid and ammonium acetate. Compound 2 afforded N-aminopyrido[3,4-dlpyridazine 11 upon treatment with hydrazine hydrate. Compound 11 reacted with triethyl orthoformate to give [1,2,4]triazolo[2',3':1,2]pyrido[4,3-d]pyridazin-10-one 12 and can be acetylated to 13. Compound 2 could be coupled with p-chlorobenzenediazonium chloride to give the pyridazino[4,5-d]pyridazine 17.
A novel, efficient, and recyclable biocatalyst for Michael addition reactions and its iron(<scp>iii</scp>) complex as promoter for alkyl oxidation reactions
作者:Khaled D. Khalil、Enas I. Ibrahim、Fakhreia A. Al-Sagheer
DOI:10.1039/c5cy01034a
日期:——
A novel, efficient, and recyclable biocatalyst for Michael addition reactions and its iron(iii) complex as promoter for alkyl oxidation reactions.