therefore, serve as C3N1 building blocks having a nitro group to afford nitropyridones and aminonitropyridines with a functional group at the 3-position. Upon treatment with malonic acid derivatives or β-keto esters, nitropyridones were obtained, whereas reactions with functionalized acetonitriles afford aminonitropyridines, via a formal transfer of an alkyl group from the ring nitrogen to the imino group
β-甲酰基-β-亚硝胺1同时具有亲电甲酰基和亲核氨基,因此,作为具有硝基的C 3 N 1结构单元,可以提供在3-位具有官能团的硝基吡啶酮和氨基硝基吡啶。经治疗丙二酸可以得到硝基吡啶酮衍生物或β-酮酯,而与官能化乙腈的反应则是通过烷基从环氮到亚氨基的正式转移而得到氨基硝基吡啶。这些程序提供了制备具有硝基的杂环的实用方法。
Reaction of pyrimidin-2(1H)-ones and -thiones with organometallic compounds. Regioselective preparation of dihydropyrimidin-2(1H)-ones and -thiones
6-Dimethyl-1-phenylpyrimidin-2(1H)-one (1) reacted with methylmagnesium iodide to afford 4,6,6-trimethyl-1-phenyl-3,6-dihydropyrimidin-2(1H)-one (8a) selectively; compound (1) reacted with methyl-lithium to give mainly 4,4,6-trimethyl-1-phenyl-3,4-dihydropyrimidin-2(1H)-one (8b). The reactions of various pyrimidin-2(1H)-ones and -thiones with organometalliccompounds, and the influence of bulkiness
first and facilesynthesis of N,N′-dialkylated 2,6,9-triazabicyclo[3.3.1]nonadienes was achieved by the [4 + 4] self-condensation of β-formyl-β-nitroenamine in the presence of ammonium acetate. The 2,6- and 2,9-dialkylated products were found to be interconvertible when dissolved in a solvent. This isomerization proceeds through intramolecular ring transformation via a common intermediate under equilibrium