d-Mannitol-derived novel chiral thioureas: Synthesis and application in asymmetric Henry reactions
作者:Miaoxi Liu、Nan Ji、Li Wang、Peng Liu、Wei He
DOI:10.1016/j.tetlet.2018.01.082
日期:2018.3
Five novel thioureas have been obtained through multi-step reactions from d-Mannitol as starting material and applied as catalysts in the asymmetric Henry reaction. Using catalyst 7a, (1S,2R)-2-nitro-1-phenylpropan-1-ol containing two chiral centers was obtained in high yield and with high selectivity (up to 95% yield, 87% ee, 91:9 dr). This catalyst also retained activity in the presence of water
A novel heterobimetallic Cu/Sm/aminophenol sulfonamide complex has been developed by a convenient one-pot method for the anti-selective asymmetric Henry reaction. The corresponding anti-β-nitro alcohols are obtained in up to 99% yield, >30:1 dr, and 98% ee. The results of control experiments and ESI-MS analysis of the complex indicate that the monomeric bimetallic Cu/Sm/1 complex would be the active
通过方便的一锅法开发了一种新型的双金属Cu / Sm /氨基苯酚磺酰胺络合物,用于抗选择性不对称亨利反应。以高达99%的收率,> 30∶1的dr和98%的ee获得相应的抗-β-硝基醇。配合物的对照实验和ESI-MS分析结果表明,单体双金属Cu / Sm / 1配合物是活性物质。
A Highly syn-Selective Nitroaldol Reaction Catalyzed by CuII-Bisimidazoline
作者:Liang Cheng、Jiaxing Dong、Jingsong You、Ge Gao、Jingbo Lan
DOI:10.1002/chem.201000650
日期:——
Catalyzing Henry: Chiral bisimidazoline 1–Cu(OTf)2, in the presence of N‐methylmorpholine as a base, was discovered to efficiently catalyze the nitroaldolreaction in a highly syn‐ and enantioselective manner for a broad range of aldehydes, including aromatic, heteroaromatic, α,β‐unsaturated, and aliphatic aldehydes (see scheme).