propionates of chiral alcohols derived from (+)-camphor are described. It is demonstrated that steric shielding as well as cation complexation are important for stereoselection. The latter effects are in part rationalized on the basis of preferential formation of (Z)- or (E)-lithium enolates.
描述了衍生自(+)-
樟脑的手性醇的
丙酸酯的非对映选择性烷基化。结果表明,立体屏蔽以及阳离子络合对于立体选择都很重要。后者的影响部分基于(Z)-或(E)-
锂烯醇盐的优先形成而合理化。