The synthesis of the pyranonaphthoquinones dehydroherbarin and anhydrofusarubin using Wacker oxidation methodology as a key step and other unexpected oxidation reactions with ceric ammonium nitrate and salcomine
作者:Adushan Pillay、Amanda L. Rousseau、Manuel A. Fernandes、Charles B. de Koning
DOI:10.1039/c2ob26126j
日期:——
the naphthalene skeleton and a Wacker oxidation reaction to construct the benzo[g]isochromene nucleus. Two interesting oxidation reactions of the intermediate isochromene enol ether of 7,9-dimethoxy-3-methyl-1H-benzo[g]isochromene-5-ol were observed. Treatment of the substrate with salcomine resulted in the formation of (3-formyl-4-hydroxy-6,8-dimethoxynaphthalene-2-yl)methyl acetate, while treatment
两种密切相关的吡喃并萘醌,脱氢水杨素和 脱水呋喃丁红素进行说明。使用Stobbe缩合反应通过以下方法实现萘核的构建:2,4-二甲氧基苯甲醛 和 2,4,5-三甲氧基苯甲醛作为它们各自的起始材料。途中的两个关键步骤包括PIFA介导的甲氧基取代基在萘骨架上的加成和Wacker氧化反应以构建苯并[ g ]异戊二烯核。观察到了7,9-二甲氧基-3-甲基-1 H-苯并[ g ]异亚甲基-5-醇的中间体异亚甲基烯醇醚的两个有趣的氧化反应。用甲氨甲碱处理底物导致形成角质形成。(3-甲酰基-4-羟基-6,8-二甲氧基萘-2-基)乙酸甲酯,而用CAN处理相同的底物会导致外消旋体的形成 (3 R,4 R)-3-羟基-7,9-二甲氧基-3-甲基-5,10-二氧代-3,4,5,10-四氢-1 H-苯并[ g ]异色n-4-基硝酸盐。