via Johnson–Claisen rearrangement of γ-hydroxy-α,β-unsaturated lactams. It has been observed that olefin geometry plays an important role in the development of the absolute stereochemistry of the product. Dependence of product configuration on the olefin geometry is explained by postulating probable transition states. The success of this method has been shown for multigram-scale synthesis of these substituted
通过γ-羟基-α,β-不饱和内
酰胺的Johnson-Claisen重排,已经开发了到环状内
酰胺C-3位置上所有
碳四级立体中心的非对映选择性途径(最高> 99%)。已经观察到
烯烃的几何形状在产物的绝对立体
化学的发展中起重要作用。通过假设可能的过渡态来解释产物构型对
烯烃几何形状的依赖性。从可商购的廉价起始原料成功地以克级合成这些取代的内
酰胺,表明了该方法的成功。通过进行(-)-
毒扁豆碱的全合成也证明了该方法的合成有用性。