Ethyl 1,4-Dihydro-4-oxo-1,8-naphthyridine-3-carboxylates by a Tandem S<sub>N</sub>Ar-Addition-Elimination Reaction
作者:Richard A. Bunce、Baskar Nammalwar
DOI:10.1002/jhet.917
日期:2012.5
steps from ethyl 2‐(2‐chloronicotinoyl)acetate. Treatment of the β‐ketoester with N,N‐dimethylformamide dimethyl acetal in N,N‐dimethylformamide (DMF) gave a 95% yield of the 2‐dimethylaminomethylene derivative. Subsequent reaction of this β‐enaminone with primary amines in DMF at 120oC for 24 h then afforded the target compounds in 47–82% yields by a tandem SNAr‐addition‐elimination reaction. Synthetic
从2-(2-氯烟酰基)乙酸乙酯分两步制备了一系列N取代的1,4-二氢-4-氧代-1,8-萘啶-3-羧酸酯。在N,N-二甲基甲酰胺(DMF)中用N,N-二甲基甲酰胺二甲基乙缩醛处理β-酮酸酯可得到95%的2-二甲基氨基亚甲基衍生物。随后,β-烯胺酮与伯胺在DMF中于120 o C反应24 h,然后通过串联的S N Ar加成消除反应以47-82%的收率得到目标化合物。提出了综合和程序上的细节以及机制上的原理。