Stereoselective synthesis and cyclisation of the acyclic precursor to auripyrone A and B
作者:Michael V. Perkins、Rebecca A. Sampson、John Joannou、Max R. Taylor
DOI:10.1016/j.tetlet.2006.03.096
日期:2006.5
The acyclic precursor to the auripyrones has been synthesized by a stereoselective aldol strategy. This compound fails to undergo cyclisation to form the spiroacetal dihydropyrone ring system found in auripyrone A and B; instead, it forms a dihydropyrone ring by cyclisation of the C11 hydroxyl onto the C15 carbonyl with subsequent dehydration. In contrast, a model compound was prepared and shown to
头孢吡酮的无环前体是通过立体选择性羟醛策略合成的。该化合物不能进行环化反应形成在Auripyrone A和B中发现的螺缩醛二氢吡喃酮环系统;相反,它通过将C11羟基环化到C15羰基上并随后脱水而形成二氢吡喃环。相反,制备了模型化合物,并显示其环化至螺缩醛二氢吡喃酮环系统和二氢吡喃酮环。