The one‐pot reaction of 4‐benzylpyridine‐3‐carbonitrile with Bredereck's reagent and subsequent treatment with either glacial acetic acid and sulfuric acid or ammonium acetate provided the new bioactive naphthyridine alkaloids lophocladine A and B, respectively.
A novelapproach for the syntheses of lophocladines A and B has been developed. These compounds were prepared in 4–6 steps with moderate to excellent overall yields. The key step involved the nucleophilic substitution of 4-chloronicotinic acid with the carbanion generated from phenylacetonitrile. Subsequent reduction of the cyano group, lactamization and oxidation furnished lophocladine A in 50% yield
A Three-Component Reaction Forming Naphthyridones – Synthesis of Lophocladine Analogs
作者:Magnus Sellstedt、Fredrik Almqvist
DOI:10.1021/ol202080x
日期:2011.10.7
A three-component reaction forming dihydro 2,7-naphthyridine-1-ones has been developed. These unstable dihydro intermediates can be either oxidized or reduced to form naphthyridones or tetrahydro naphthyridones, respectively. The reaction tolerates a large variety of aldehydes and amines, and the produced compounds are analogs of the natural product lophocladine A.
已开发出形成二氢 2,7-naphthyridine-1-ones 的三组分反应。这些不稳定的二氢中间体可以被氧化或还原以分别形成萘啶酮或四氢萘啶酮。该反应耐受多种醛和胺,产生的化合物是天然产物洛霍克拉定 A 的类似物。