Some nonenzymic epoxide-initiated polyolefin cyclisations are reported. The presented molecules are partially constrained analogues of (3S)-oxidosqualene, the natural substrate to many important cyclase enzymes. These model compounds feature a preformed C-ring with built-in stereochemical information. The experimental results allow for an instructive comparison with the enzymic processes, particularly those of the cyclases in steroid biosynthesis (i.e.lanosterol synthase).
有报告称,一些非酶
环氧化物引发的多烯烃环化反应。所呈现的分子是(3S)-氧代
骨化醇的部分受限类似物,是许多重要环化酶的天然底物。这些模型化合物具有预先形成的C-环,并带有内置的立体
化学信息。实验结果可以与酶促反应进行有指导意义的比较,特别是类
固醇生物合成中的环化酶(如
羊毛甾醇合成酶)。