我们从2-氯喹啉-3-甲醛与活性亚甲基化合物(AMCs)的MBH乙酸酯进行了简单,简便的of啶和菲啶的合成。发现产物的形成取决于AMC的官能团。例如,氰基乙酸乙酯和丙二腈有利于形成cr啶和氰基乙酰胺,而硝基乙酸乙酯和丙二酸酯则有利于形成有角度融合的菲啶。导致菲啶形成的反应通过S N 2'中间体的单键旋转进行,这归因于AMCs官能团和喹啉氮之间的电子/空间排斥。
Base-free amination of BH acetates of 2-chloroquinolinyl-3-carboxaldehydes: a facile route to the synthesis of N-substituted-1,2-dihydrobenzo[b][1,8]naphthyridines
作者:Bhawana Singh、Atish Chandra、Radhey M. Singh
DOI:10.1016/j.tet.2011.01.076
日期:2011.4
An efficient base-free one-pot synthesis of 1,2-dihydrobenzo[b][1,8]naphthyridines from BH acetates of 2-chloro-3-formylquinolines and activated alkenes followed by their acetylation, with different amines have been reported. These reactions are completed in very short time and provided the products in good to excellent yields. We further explored the scope of BH acetate with carbon nucleophile providing
从2-氯-3-甲酰基喹啉的BH乙酸酯和活化的烯烃,然后用不同的胺进行乙酰化,可以有效地无锅一锅法合成1,2-二氢苯并[ b ] [1,8]萘啶。这些反应可在很短的时间内完成,并以良好的收率提供了良好的产品。我们进一步探索了具有碳亲核试剂的BH乙酸酯的范围,为在温和条件下以优异的收率合成a啶衍生物提供了一条新途径。
Cascade S<sub>N</sub>2′-S<sub>N</sub>Ar, Elimination, and 1,5-Hydride Shift Reactions by Acetylacetone/Acetoacetic Esters: Synthesis of 9,10-Dihydroacridines
作者:Tanu Gupta、Kishor Chandra Bharadwaj、Radhey M. Singh
DOI:10.1002/ejoc.201600911
日期:2016.10
A reaction involving the use of acetylacetone/methyl acetoacetate and Morita–Baylis–Hillmanacetates for the efficient, one-pot, metal-free synthesis of 9,10-dihydroacridines at room temperature was developed. The cascade of reactions involved sequential SN2′–SNAr reactions, elimination, and reduction through ketene generation and hydride transfer. Evidence for hydride shift via a ketene intermediate