芳环的烷基化是有机合成中的主要挑战,因为可以构建更复杂的碳骨架。据报道,通过丙二酸酯将3-硝基-4-吡啶基甲酸甲酯(1)中的硝基进行亲核芳香取代,使吡啶烷基化。α-(3-吡啶基)丙二酸酯产物(3)的多功能性通过许多新的3-烷基化吡啶和新的稠合双杂环的形成来证明。选择性地制备出顺式2-卤甲基-4-(3-吡啶基)四氢呋喃产物。通过一系列NMR实验,获得了几乎所有产品的精确1 H和13 C NMR赋值。
α-(3-Pyridyl)malonates: preparation and synthetic applications
作者:Freddy Tjosås、Nina Marie Pettersen、Anne Fiksdahl
DOI:10.1016/j.tet.2007.09.026
日期:2007.11
can be constructed. The alkylation of pyridine by nucleophilic aromatic substitution of the nitro group in methyl 3-nitro-4-pyridylcarboxylate (1) with malonic ester is reported. The versatility of the α-(3-pyridyl) malonic ester product (3) is demonstrated by the formation of a number of new 3-alkylated pyridines and new fused bis-heterocycles. cis 2-Halomethyl-4-(3-pyridyl)tetrahydrofuran products were
芳环的烷基化是有机合成中的主要挑战,因为可以构建更复杂的碳骨架。据报道,通过丙二酸酯将3-硝基-4-吡啶基甲酸甲酯(1)中的硝基进行亲核芳香取代,使吡啶烷基化。α-(3-吡啶基)丙二酸酯产物(3)的多功能性通过许多新的3-烷基化吡啶和新的稠合双杂环的形成来证明。选择性地制备出顺式2-卤甲基-4-(3-吡啶基)四氢呋喃产物。通过一系列NMR实验,获得了几乎所有产品的精确1 H和13 C NMR赋值。
Studies on Reactive Pyridylketones Formed by Weinreb Transformations
作者:Vegar Stockmann、Svein Jacob Kaspersen、Alexander Nicolaisen、Anne Fiksdahl
DOI:10.1002/jhet.836
日期:2012.5
on the Weinreb's amide transformation and includes a quarternary ammonium intermediate and subsequent elimination. Additionally, based on our previous results on the malonate alkylation of 3‐nitropyridines and subsequent synthetic applications, we present the studies on the transformation of pyridyl malonate derivative 3 via the Weinreb's amide 4 and reactive methylpyridyl‐ (17) and allylpyridyl‐ketone