交叉亲电反应是 CC 键形成的一个有前景的策略。最近的研究主要集中在与有机卤化物的反应上。在这里,我们报告了 CN 和 CO 亲电试剂之间的偶联反应,证明了通过 CN 和 CO 裂解构建 CC 键的可能性。已经研究了苄基/芳基铵盐和乙烯基/芳基 CO 亲电试剂之间的几种反应。初步机理研究表明,苄基铵是通过自由基机制活化的。
Synthesis of tertiary amines by direct Brønsted acid catalyzed reductive amination
作者:Mohanad A. Hussein、An H. Dinh、Vien T. Huynh、Thanh Vinh Nguyen
DOI:10.1039/d0cc02955f
日期:——
reductive amination reaction of carbonyl compounds. Despite developments of numerous new reductive amination methods in the past few decades, this reaction generally requires non-atom-economic processes with harsh conditions and toxic transition-metal catalysts. Herein, we report simple yet practical protocols using triflic acid as a catalyst to efficiently promote the direct reductive amination reactions
In recognition of the need to develop novel therapeutic agents and efficient methods for the synthesis thereof, the present invention provides novel compounds of general formula (I):
1
and pharmaceutically acceptable derivatives thereof, wherein R
1
, R
2
, R
3
, n, X and Y are as defined herein. The present invention also provides pharmaceutical compositions comprising a compound of formula (I) and a pharmaceutically acceptable carrier. The present invention further provides compounds capable of inhibiting histone deacetylatase activity and methods for treating disorders regulated by histone deacetylase activity (e.g., cancer and protozoal infections) comprising administering a therapeutically effective amount of a compound of formula (I) to a subject in need thereof. The present invention additionally provides methods for modulating the glucose-sensitive subset of genes downstream of Ure2p. The present invention also provides methods for preparing compounds of the invention.
Transition‐Metal‐Free Reductive Functionalization of Tertiary Carboxamides and Lactams for α‐Branched Amine Synthesis
作者:Derek Yiren Ong、Dongyang Fan、Darren J. Dixon、Shunsuke Chiba
DOI:10.1002/anie.202004272
日期:2020.7.13
A new method for the synthesis of α‐branched amines by reductive functionalization of tertiary carboxamides and lactams is described. The process relies on the efficient and controlled reduction of tertiary amides by a sodium hydride/sodiumiodide composite, in situ treatment of the resulting anionic hemiaminal with trimethylsilyl chloride and subsequent coupling with nucleophilic reagents including
In recognition of the need to develop novel therapeutic agents, the present invention provides novel histone deacetylase inhibitors. These compounds include an ester bond making them sensitive to deactivation by esterases. Therefore, these compounds are particularly useful in the treatment of skin disorders. When the compounds reaches the bloodstream, an esterase or an enzyme with esterase activity cleaves the compound into biologically inactive fragments or fragments with greatly reduced activity Ideally these degradation products exhibit a short serum and/or systemic half-life and are eliminated rapidly. These compounds and pharmaceutical compositions thereof are particularly useful in treating cutaneous T-cell lymphoma, neurofibromatosis, psoriasis, hair loss, skin pigmentation, and dermatitis, for example. The present invention also provides methods for preparing compounds of the invention and intermediates thereto.
Catalytic Cyanation of C–N Bonds with CO<sub>2</sub>/NH<sub>3</sub>
作者:Fachao Yan、Jian-Fei Bai、Yanan Dong、Shaoli Liu、Chen Li、Chen-Xia Du、Yuehui Li
DOI:10.1021/jacsau.2c00392
日期:2022.11.28
to the Sandmeyer reaction of anilines, was developed using reductive cyanation with CO2/NH3. A broad array of α-aryl nitriles was obtained in high yields and regioselectivity by C–N cleavage of intermediates as ammonium salts. Good tolerance of functionalgroups such as ethers, CF3, F, Cl, esters, indoles, and benzothiophenes was achieved. Using 13CO2, a 13C-labeled tryptamine homologue (five steps
苄基 C-N 键的氰化可用于制备重要的 α-芳基腈。α-(杂)芳基胺的第一个一般催化氰化反应类似于苯胺的 Sandmeyer 反应,是使用 CO 2 /NH 3的还原氰化反应开发的。通过中间体 C-N 裂解作为铵盐,以高产率和区域选择性获得了广泛的 α-芳基腈。实现了对醚、CF 3、F、Cl、酯、吲哚和苯并噻吩等官能团的良好耐受性。使用13 CO 2,一个13合成了 C-标记的色胺同系物(五步,31% 产率)和 Cysmethynil(六步,37% 产率)。配体的电子效应和空间效应都会影响烷基镍物质与亲电子异氰酸酯甲硅烷基酯的反应性,从而决定氰化反应的反应性和选择性。这项工作有助于了解 CO 2 /NH 3的可控活化,并提供胺氰化反应在生物相关分子合成中的潜在潜力。