Pd-Catalyzed Desymmetric Intramolecular <i>O</i>-Arylation Reaction: Enantioselective Synthesis of (3,4-Dihydro-2<i>H</i>-chromen-3-yl)methanols
作者:Wenqiang Yang、Jiajie Yan、Yan Long、Shasha Zhang、Jianguang Liu、Youlin Zeng、Qian Cai
DOI:10.1021/ol402911y
日期:2013.12.6
An enantioselective intramolecular O-arylation was achieved through desymmetrization with Pd-catalyzed coupling reactions. The intramolecular asymmetric aryl C-O coupling reactions of 2-(2-haloaryl)propane-1,3-diols led to the enantioselective formation of chiral (3,4-dihydro-2H-chromen-3-yl)methanols in good yields and high enantiomeric selectivity.
Light‐Promoted Nickel Catalysis: Etherification of Aryl Electrophiles with Alcohols Catalyzed by a Ni
<sup>II</sup>
‐Aryl Complex
highly effective C−O coupling reaction of (hetero)aryl electrophiles with primary and secondary alcohols is reported. Catalyzed by a NiII‐arylcomplex under long‐wave UV (390–395 nm) irradiation in the presence of a soluble amine base without any additional photosensitizer, the reaction enables the etherification of aryl bromides and arylchlorides as well as sulfonates with a wide range of primary
据报道,(杂)芳基亲电试剂与伯醇和仲醇的高效C-O偶联反应。在可溶性胺碱的存在下,在没有任何其他光敏剂的情况下,在长波紫外线(390–395 nm)辐射下,由Ni II-芳基络合物催化,该反应可以使芳基溴化物和芳基氯化物以及磺酸盐与多种伯和仲脂族醇,可提供合成上重要的醚。分子内CO偶联也是可能的。该反应似乎通过Ni I -Ni III催化循环进行。
Biocatalytic Desymmetrization of Prochiral 3-Aryl and 3-Arylmethyl Glutaramides: Different Remote Substituent Effect on Catalytic Efficiency and Enantioselectivity
作者:Yu-Fei Ao、Li-Bin Zhang、Qi-Qiang Wang、De-Xian Wang、Mei-Xiang Wang
DOI:10.1002/adsc.201800956
日期:2018.12.3
efficiently afforded 3‐substituted glutaric acid monoamides in up to 95% yield and >99.5% ee. Even far away from the reaction site, the substituents on the aryl still have a significant effect on the catalytic activity and enantioselectivity and different remote substituent effect was observed for the two types of substrates. The synthetic application of biocatalyticdesymmetrization was demonstrated by