Palladium‐Catalyzed Methylation of Nitroarenes with Methanol
作者:Lin Wang、Helfried Neumann、Matthias Beller
DOI:10.1002/anie.201814146
日期:2019.4.8
procedure for the synthesis of N‐methyl‐arylamines directly from nitroarenes using methanol as green methylating agent was developed. The key to success is the use of a specific catalyst system consisting of palladium acetate and the ligand 1‐[2,6‐bis(isopropyl)phenyl]‐2‐[tert‐butyl(2‐pyridinyl)phosphino]‐1H‐Imidazole (L1). The generality of this protocol is demonstrated in the synthesis of more than 20
and moisture‐stable, highly efficient ruthenium NNN pincer complex is reported for the first time to catalyze the tandem transformation of various aromatic and aliphatic nitro compounds into the corresponding N‐methylated amines in up to 98 % yield by using methanol as a green methylating agent. Gram‐scale reactions of challenging nitro substrates demonstrated the practical application aspects of this
Highly Selective N-Monomethylanilines Synthesis From Nitroarene and Formaldehyde via Kinetically Excluding of the Thermodynamically Favorable N,N-Dimethylation Reaction
作者:Hongli Wang、Hangkong Yuan、Benqun Yang、Xingchao Dai、Shan Xu、Feng Shi
DOI:10.1021/acscatal.8b00116
日期:2018.5.4
The synthesis of N-monomethylamine remains a challenging topic because the N,N-dimethylation reaction is thermodynamically favorable. In this work, the kinetically controlled N-monomethylamine synthesis from nitroarene and paraformaldehyde/H2 is reported to have superhigh N-monomethylamine selectivity in the presence of a Pd/TiO2 catalyst. The superior selectivity should be attributed to the preferential
N-单甲胺的合成仍然是一个具有挑战性的课题,因为N,N-二甲基化反应在热力学上是有利的。在这项工作中,据报道,在Pd / TiO 2催化剂存在下,由硝基芳烃和多聚甲醛/ H 2进行动力学控制的N-单甲胺合成具有超高的N-单甲胺选择性。如NH 3 / Me 2 NH-TPD所表明的那样,较高的选择性应归因于Pd / TiO 2表面伯胺优先于N-单甲胺的吸附,而优良的催化活性可能与良好的H有关。2 NH阐明的催化剂的活化能力和高胺吸附能力3 -TPD和H 2 -TPR测试。以含有甲基,甲氧基,羟基,氟化物,三氟甲基,酯和酰胺取代基的各种硝基芳烃为起始原料,均获得了良好的结果,该方法在药物中的潜在合成效用通过药物分子的N-单甲基化来说明,例如如clinidipine,尼美舒利,普鲁卡因和氨基水杨酸甲酯。
Tandem Acceptorless Dehydrogenative Coupling–Decyanation under Nickel Catalysis
作者:Siba P. Midya、Murugan Subaramanian、Reshma Babu、Vinita Yadav、Ekambaram Balaraman
DOI:10.1021/acs.joc.1c00592
日期:2021.6.4
reported. This unprecedented C═Cbond-forming methodology takes place in a tandem manner with the formation of formamide as a sole byproduct. The significant advantages of this strategy are the low-cost nickel catalyst, good functional group compatibility (ether, thioether, halo, cyano, ester, amino, N/O/S heterocycles; 43 examples), synthetic convenience, and high reaction selectivity and efficiency
Method and compositions for identifying anti-HIV therapeutic compounds
申请人:Arimilli N. Murty
公开号:US20050239054A1
公开(公告)日:2005-10-27
Methods are provided for identifying anti-HIV therapeutic compounds substituted with carboxyl ester or phosphonate ester groups. Libraries of such compounds are screened optionally using the novel enzyme GS-7340 Ester Hydrolase. Compositions and methods relating to GS-7340 Ester Hydrolase also are provided.