Asymmetric Hydrogenation of Ketones and Enones with Chiral Lewis Base Derived Frustrated Lewis Pairs
作者:Bochao Gao、Xiangqing Feng、Wei Meng、Haifeng Du
DOI:10.1002/anie.201914568
日期:2020.3.9
The concept of frustratedLewispairs (FLPs) has been widely applied in various research areas, and metal-free hydrogenation undoubtedly belongs to the most significant and successful ones. In the past decade, great efforts have been devoted to the synthesis of chiral boron Lewis acids. In a sharp contrast, chiral Lewisbase derived FLPs have rarely been disclosed for the asymmetric hydrogenation.
Preparation of aminosaccharides using ester-imine condensations: syntheses of methyl -benzoylacosaminide and methyl -[oxo(phenylmethoxy) acetyl)daunosaminide from (S)-ethyl 3-hydroxybutyrate
作者:Judith C. Gallucci、Deok-Chan Ha、David J. Hart
DOI:10.1016/0040-4020(89)80126-7
日期:1989.1
The dianion of (S)-ethyl β-hydroxybutyrate (1) was treated with -trimethylsilyl Imine 2 to afford β-lactam 4. The same dianion reacted with -ary1 imine 10 to give β-lactams 11, 12, and 13. A three-step sequence was used to convert 4 into the β-lactam-pyran hybrid 9 while a five-step sequence was developed to transform 11 and 12 into 9. Application of the carboxyinversion reaction to derivatives of
A Highly Efficient and Direct Approach for Synthesis of Enantiopure β-Amino Alcohols by Reductive Cross-Coupling of Chiral <i>N</i>-<i>tert</i>-Butanesulfinyl Imines with Aldehydes
作者:Yu-Wu Zhong、Yi-Zhou Dong、Kai Fang、Kenji Izumi、Ming-Hua Xu、Guo-Qiang Lin
DOI:10.1021/ja054401w
日期:2005.8.1
approach for the synthesis of optically pure beta-amino alcohols by the SmI2-induced reductive cross-coupling of chiral N-tert-butanesulfinyl imines with aldehydes was developed. This method allows the preparation of a broad range of chiral beta-amino alcohols, including functionalized ones under mild conditions. It provides a straightforward access to enantiopure beta-amino alcohols that are widely