Stereoselective Synthesis of Tertiary Ethers through Geometric Control of Highly Substituted Oxocarbenium Ions
作者:Lei Liu、Paul E. Floreancig
DOI:10.1002/anie.201002281
日期:2010.8.9
Fully substituted, fully controlled! The geometries of 1,1‐disubstituted oxocarbeniumions and the conformations of oxocarbeniumions that contain a tertiary stereocenter can be predicted based on simple models. These models have been applied to highlystereoselective syntheses of tetrahydropyran derivatives that contain tertiaryethers (see scheme; RL, RS, and RN represent large, small, and nucleophilic
全面换人,全面控制!1,1-二取代的氧碳鎓离子的几何形状和包含叔立构中心的氧碳鎓离子的构象可以基于简单的模型来预测。这些模型已应用于含有叔醚的四氢吡喃衍生物的高度立体选择性合成(参见方案;R L、RS和 R N分别代表大基团、小基团和亲核基团)。
Parallel Kinetic Resolution of Unsymmetrical Acyclic Aliphatic <i>syn</i>-1,3-Diols
作者:Hui Yang、Wen-Hua Zheng
DOI:10.1021/acs.orglett.9b01801
日期:2019.7.5
catalytic parallelkineticresolution of unsymmetrical acyclic aliphatic syn-1,3-diol derived acetals mediated by chiral phosphoric acid. This method provides stereoselective access to a variety of syn-1,3-diols as valuable building blocks with high enantioselectivity. Moreover, this mild system allows for site-selective protection of optically pure syn-1,3-diols in excellent regioselectivity.