Synthesis of Vitamin K and Related Naphthoquinones via Demethoxycarbonylative Annulations and a Retro-Wittig Rearrangement
作者:Dipakranjan Mal、Ketaki Ghosh、Supriti Jana
DOI:10.1021/acs.orglett.5b02920
日期:2015.12.4
Anionic annulations of 3-nucleofugal phthalides with α-alkyl(aryl)acrylates involving a demethoxycarbonylation provide a succinct synthesis of vitamin K and related naphthoquinones. Also reported is a new cascade reaction stemming from a Cope–retro-Wittig rearrangement. This cascade leads to direct formation of 1-hydroxy-4-prenyloxynaphthalene-2-carboxylates from the corresponding α-prenyl acrylate
3-核真菌邻苯二甲酸酯与α-烷基(芳基)丙烯酸酯的阴离子环化涉及脱甲氧基羰基化,可简捷地合成维生素K和相关的萘醌。还报道了源自Cope-retro-Wittig重排的新的级联反应。该级联导致由相应的α-异戊烯基丙烯酸酯受体直接形成1-羟基-4-异戊烯氧基萘-2-羧酸酯。