Ni-Catalyzed Reductive Cyanation of Aryl Halides and Phenol Derivatives via Transnitrilation
作者:L. Reginald Mills、Joshua M. Graham、Purvish Patel、Sophie A. L. Rousseaux
DOI:10.1021/jacs.9b11208
日期:2019.12.11
reductive coupling for the synthesis of benzonitriles from aryl (pseudo)halides and an electrophilic cyanating reagent, 2-methyl-2-phenyl malononitrile (MPMN). MPMN is a bench-stable, carbon-bound electrophilic CN reagent that does not release cyanide under the reaction conditions. A variety of medicinally relevant benzonitriles can be made in good yields. Addition of NaBr to the reaction mixture allows for
Aryl Ether Syntheses via Aromatic Substitution Proceeding under Mild Conditions
作者:Shin Ando、Marina Tsuzaki、Tadao Ishizuka
DOI:10.1021/acs.joc.0c01250
日期:2020.9.4
In this study, mild conditions for aromatic substitutions during the syntheses of aryl ethers were developed. In the reaction conditions, the choices of solvent, base, and the sequence for the addition of the reagents proved important. A wide variety of alcohols were used directly as nucleophiles and smoothly reacted with aryl chlorides that possessed either a nitro or a cyano group at either the ortho-
Cobalt-Catalyzed Enantioconvergent Hydrogenation of Minimally Functionalized Isomeric Olefins
作者:Peng Lu、Hongliang Wang、Yihui Mao、Xin Hong、Zhan Lu
DOI:10.1021/jacs.2c08525
日期:2022.9.28
established methods often require geometrically pure olefins. The enantioconvergent reaction provided the possibility to access a single stereoisomer via hydrogenation of E/Z-olefin mixtures; however, a polar functional group next to the carbon–carbon double bond was usually necessary. Here, we reported a cobalt-catalyzed enantioconvergent hydrogenation of readily available minimally functionalized E/Z-olefin
由于对映体纯化合物的高需求,烯烃不对称氢化的研究在药物分子合成和化学工业中都具有重要意义。已建立的方法通常需要几何纯烯烃。对映收敛反应提供了通过氢化E / Z -烯烃混合物获得单一立体异构体的可能性;然而,通常需要在碳-碳双键旁边的极性官能团。在这里,我们报道了一种钴催化的对映收敛氢化容易获得的最小官能化E / Z-烯烃混合物。该策略显示出良好的官能团耐受性,并为对映收敛转化提供了一种替代方法。初步机理研究表明,钴催化异构化是实现收敛转化的关键。
Palladium-Catalyzed Intermolecular Carbon−Oxygen Bond Formation: A New Synthesis of Aryl Ethers
作者:Michael Palucki、John P. Wolfe、Stephen L. Buchwald
DOI:10.1021/ja9640152
日期:1997.4.1
Bicyclic (alkyl)(amino)carbene (BICAAC) as a metal-free catalyst for reduction of nitriles to amines
作者:Nimisha Gautam、Ratan Logdi、Sreejyothi P.、N. M. Rajendran、Ashwani K. Tiwari、Swadhin K. Mandal
DOI:10.1039/d1cc06962d
日期:——
Bicyclic (alkyl)(amino)carbene (BICAAC) is introduced as a metal-free catalyst for the reduction of various nitriles to the corresponding aminehydrochloride salts in the presence of pinacolborane. Mechanistic investigations combining experiments and DFT calculations suggest a B–H addition to the carbene center, which acts as a carrier of the hydride source.