[reaction: see text] We report here the catalytic asymmetric conjugatereduction of enones using ethanol as a hydride source. The reaction was carried out in the presence of a chiral Pd complex at ambient temperature in ethanol, and the desired products were obtained in high chemical yield and high enantioselectivity. We applied this novel reaction to the catalytic asymmetric synthesis of warfarin (96%
concise and efficient hydrodefluorination process was developed for the synthesis of gem-difluoroalkenes. This reaction employs rongalite as a masked proton source and does not require any additional catalysts or reductants. Notably, trifluoromethyl alkenes having both terminal and internal double bonds are compatible with this process, allowing for a wider range of substrates. The successful late-stage
Asymmetric and Chemoselective Iridium Catalyzed Hydrogenation of Conjugated Unsaturated Oxime Ethers
作者:Shaohu Zhao、Bram B. C. Peters、Haili Zhang、Ruize Xue、Yixin Yang、Liuying Wu、Tianrui Huang、Lei He、Pher G. Andersson、Taigang Zhou
DOI:10.1002/chem.202401333
日期:2024.7.11
The selective hydrogenation of α,β-unsaturated oxime ethers is described. The hydrogenation reaction proceeded smoothly at (20–50 bar) room temperature. The generated chiral oxime ethers showed good isolated yields and excellent enantioselectivity (84 %–99 % yield, >97 % ee). The hydrogenation products could be further hydrolysed to chiral ketones.