Methodology has been sought towards obtaining a 2-chloro-1,4-naphthoquinone bearing hydroxyl groups in the adjoining ring for obtaining either kermesic or carminic acids. In the first of these objectives, kermesic acid has been synthesised from 6-chloro-2,5,8-trihydroxynaphtho-1,4-quinone by the regioselective cycloaddition of the 1,2-diacetate formed by its acetylation-aided tautomerism and cycloaddition
已经寻求方法学以获得在相邻的环中带有羟基的2-
氯-1,4-
萘醌,从而获得
干酪酸或胭脂酸。在这些目标的第一个目标中,通过乙酰化辅助互变异构和环加成反应形成的1,2-二
乙酸酯的区域选择性环加成反应,由6-
氯-2,5,8-三羟基
萘-1,4-醌合成了
草酸(E)-和(Z)-3-烷氧基羰基-2,4-双(三甲基甲
硅烷氧基)戊-1,3-二烯。母体未乙酰化的醌抗环加成。