Conversion of xanthyrones into glutaconic anhydride–pyrone (GP) compounds in strong acid media: selective deuteriation as between chelated and unchelated acetyls
作者:Leslie Crombie、Roderick V. Dove
DOI:10.1039/p19960001695
日期:——
deuteriated acids show that deuterium is introduced at C-5′ and the unchelatedacetyl of GP1, the second acetyl being apparently protected by chelation. This is supported by benzenoid test examples, though in the naphthalene series acetyl migration also occurs through deacylation/reacylation. An explanation of the protective effect of chelation against acid catalysed enolisation of the acetyl methyl is
通过用浓H 2 SO 4或F 3 CCO 2 H处理二烷基黄体烯醇得到的吡喃酮-戊二酸酐(GP1)的结构和形成机理得到进一步支持,并制备了新的GP2示例。用氘代酸进行的实验表明,氘是在C-5'和GP1的未螯合乙酰基上引入的,第二个乙酰基显然受到螯合的保护。尽管在萘系列中乙酰迁移也通过脱酰/再酰化而发生,但苯类测试实例也证明了这一点。提出了螯合对乙酰甲基的酸催化烯醇化的保护作用的解释。