tert-Butyl-{(E)-3-[(E)-tert-butylimino]-2-nitro-propenyl}-amine 在
silica gel 作用下,
反应 24.0h,
以98%的产率得到3-tert-butylamino-2-nitro-2-propenal
参考文献:
名称:
New Synthetic Equivalent of Nitromalonaldehyde Treatable in Organic Media
摘要:
beta-Nitroenamines having a formyl group at the beta-position behave as the synthetic equivalent of unstable nitromalonaldehyde, which is a useful synthon for syntheses of versatile nitro compounds. High solubility of the nitroenamines into general organic solvents enables us to conduct reactions in the organic media accompanied by easy experimental manipulations and considerable safety. When nitroenamines are treated with 1,2-bifunctional nucleophiles such as hydrazines, hydroxylamine and glycine ester, nitrated pyrazoles, isoxazole and pyrrole-2-carboxylate were readily prepared. This methodology was also applicable to guanidines and 1,2-diamines, leading to pyrimidines and 1,4-diazepines, respectively.
β-Nitroenamine having a formyl group behaves as the synthetic equivalent of unstable nitromalonaldehyde upon treatment with ketones under basic conditions and leads to 2,6-disubstituted 4-nitrophenols. The present method is safer than the conventional one using sodiumnitromalonaldehyde and enables the preparation of hitherto unknown nitrophenols.
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。
Construction of 3,5-dinitrated 1,4-dihydropyridines modifiable at 1,4-positions by a reaction of β-formyl-β-nitroenamines with aldehydes
A novel and efficient method for the synthesis of 4-substituted 3,5-dinitro-1,4-dihydropyridines by a reaction of β-formyl-β-nitroenamines with aldehydes was developed.
Reactions of β-formyl-β-nitroenamine with anilines afforded N,N’-diaryl-α-nitro-β-dialdimines; however, only small amounts of dialdimines were obtained when anilines possessing an electron-withdrawing group were employed. This disadvantage was overcome by adding anilinium salts to control the equilibrium, which resulted in the formation of dialdimines in considerably improved yields. This method facilitated