用于工业相关氢化反应的高效和选择性纳米结构催化剂的开发继续是化学研究的实际目标。尤其是腈和硝基芳烃的氢化对于伯胺的生产非常重要,伯胺构成了高级化学品,生命科学分子和材料的重要原料和关键中间体。在这里,我们报道了石墨烯壳包封的Co 3 O 4的制备-和钴-纳米颗粒通过碳上对苯二甲酸钴对苯二甲酸MOF的模板合成和随后的热解而负载在碳上。所得的纳米颗粒产生稳定且可重复使用的催化剂,用于官能化和结构多样的芳族,杂环和脂肪族腈以及硝基化合物选择性氢化为伯胺(> 65实例)。这种新型的基于非贵金属的氢化方案的合成和实用性通过将数种反应的规模扩大到数克规模并回收催化剂得到了证明。
A method for the preparation of citalopram comprising reaction of a compound of formula 5-aminomethyl-1-(3-dimethylamino-propyl)-1-(4-fluoro-phenyl)-1,3-dihydro-isobenzofuran with an oxidising agent to prepare citalopram.
Nickel-catalyzed hydrogenative coupling of nitriles and amines for general amine synthesis
作者:Vishwas G. Chandrashekhar、Wolfgang Baumann、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1126/science.abn7565
日期:2022.6.24
Efficient and general methods for the synthesis of amines remain in high demand in the chemical industry. Among the many known processes, catalytic hydrogenation is a cost-effective and industrially proven reaction and currently used to produce a wide array of such compounds. We report a homogeneous nickel catalyst for hydrogenative cross coupling of a range of aromatic, heteroaromatic, and aliphatic
Stable and reusable Ni-based nanoparticles for general and selective hydrogenation of nitriles to amines
作者:Zhuang Ma、Vishwas G. Chandrashekhar、Bei Zhou、Asma M. Alenad、Nils Rockstroh、Stephan Bartling、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1039/d2sc02961h
日期:——
The applicability of the optimal catalyst material is shown by hydrogenation of >110 diverse aliphatic and aromatic nitriles including functionalized and industrially relevant substrates. Challenging heterocyclic nitriles, specifically cyanopyridines, provided the corresponding primary amines in good to excellent yields. The resulting amines serve as important precursors and intermediates for the preparation
二氧化硅负载的超小 Ni 纳米颗粒允许在温和条件下将各种腈类普遍和选择性地氢化为伯胺。通过煅烧由 Ni( II ) 生成的模板材料)硝酸盐和胶体二氧化硅在空气下,随后在分子氢存在下还原,制备最佳催化剂。制备的负载型纳米颗粒稳定,使用方便,易于回收利用。最佳催化剂材料的适用性通过对超过 110 种不同的脂肪族和芳香族腈(包括功能化和工业相关底物)进行氢化来证明。具有挑战性的杂环腈,特别是氰基吡啶,以良好的收率提供了相应的伯胺。所得胺可作为制备众多生命科学产品和聚合物的重要前体和中间体。