Polyketoenols and chelates. Glaucyrones and their reactions with magnesium methoxide
作者:S. Richard Baker、Leslie Crombie
DOI:10.1039/p19810000178
日期:——
complete ester exchange in the reaction of 3,3′-diacetyl-5,5′-bisethoxycarbonylglaucyrone (1) with excess of magnesium methoxide, in accord with the mechanism proposed. On reaction with the latter reagent, the two new glaucyrones give aromatic penta-esters (11) and (14), and their mechanisms of formation are discussed. Heating these penta-esters effects cyclisation to xanthyrones having aromatic side-chain
使用先前论文的吡喃熔融方法,已经制备了3,3',5,5'-四甲氧基羰基葡糖酮(2)和互变异构体不对称的3'-乙酰基-3,5,5'-三甲氧基葡糖酮(5)。根据提出的机理,可以调节条件以防止3,3'-二乙酰基-5,5'-双乙氧基羰基葡糖酮(1)与过量的甲醇镁反应中的完全酯交换。在与后一种试剂反应时,这两种新的青草酮产生了芳香族五酯(11)和(14),并讨论了它们的形成机理。加热这些五酯会环化成分别具有芳族侧链末端的x吨酮(13)和(16)。