Strategy for the synthesis of 2,2-disubstituted 8-azachromanones via Horner–Wadsworth–Emmons olefination
作者:Taras V. Omelian、Eugeniy N. Ostapchuk、Alexey V. Dobrydnev、Yehor S. Malets、Volodymyr S. Brovarets、Oleksandr O. Grygorenko
DOI:10.1007/s10593-020-02646-z
日期:2020.2
A series of 2,2-disubstituted 8-azachromanones, including spirocyclic compounds, have been synthesized via Horner–Wadsworth– Emmons reaction. Dimethyl methylphosphonate was acylated with methyl 2-methoxypyridine-3-carboxylate to afford the key intermediate – dimethyl [2-(2-methoxypyridin-3-yl)-2-oxoethyl]phosphonate. Further reaction of this phosphonate and ketones followed by treatment with TMSCl–NaI
通过霍纳-沃兹沃思-艾蒙斯反应合成了一系列2,2-二取代的8-氮杂苯并二氢吡喃酮,包括螺环化合物。用2-甲氧基吡啶-3-羧酸甲酯将甲基膦酸二甲酯酰化,得到关键中间体– [2-(2-甲氧基吡啶-3-基)-2-氧代乙基]膦酸二甲酯。该膦酸酯和酮的进一步反应,然后用TMSC1-NaI处理,可得到目标8-氮杂色酮。已经研究了开发的合成方法的范围和局限性。