Transition-Metal-Free Tandem Cyclization/<i>N</i>-Arylation Reaction: A Method To Access Biaryl Sultam Derivatives via a Diradical Pathway
作者:Vijaykumar H. Thorat、Jen-Chieh Hsieh、Chien-Hong Cheng
DOI:10.1021/acs.orglett.0c02393
日期:2020.8.21
This reaction goes through the intramolecular homolytic cyclization to generate an N–H biaryl sultam intermediate, which enables aryne insertion to access diversely functionalized biaryl sultam derivatives with high yields. The mechanism study indicates that homolytic cyclization is executed by a diradical species, initiated from the thermaldecomposition of 1,2,3,4-benzothiatriazine-1,1-dioxide to release
The compounds of the following formula:
wherein Ar, R and R
1
have the meanings given in the specification. This series of sulfonamido derivatives with a conserved uronamide group at the 5′ position provide superior A3 receptor affinity as well as selectivity. These new adenosine agonists are sulfonamido derivatives N-substituted with aliphatic groups (cyclic or linear) or aromatic radicals.
The invention provides 1,2-substituted cyclic compounds useful for treatment of diseases or disorders arising from abnormal or inappropriate cell proliferation, such as tumour growth, tumour metastasis and associated angiogenesis, as well as pharmaceutical compositions comprising these compounds and their use in methods of treatment.
The present invention provides compounds of the formula
wherein Ar, R and R
1
have a meaning as defined herein in the specification. Compounds of formula (I) are agonists of the A
3
adenosine receptor and, thus, may be employed for the treatment of conditions mediated by the A
3
adenosine receptor. Accordingly, the compounds of formula (I) may be employed for treatment of behavioral depression, cerebral ischemia, hypotension, chemically induced seizures, inflammatory diseases, asthma, and cancer diseases expressing the adenosine A
3
receptor.
Metal-Free N–H/C–H Carbonylation by Phenyl Isocyanate: Divergent Synthesis of Six-Membered <i>N</i>-Heterocycles
作者:Karthick Govindan、Alageswaran Jayaram、Tamilselvan Duraisamy、Nian-Qi Chen、Wei-Yu Lin
DOI:10.1021/acs.joc.2c01026
日期:2022.7.1
We disclose a method using phenyl isocyanate to synthesize carbonyl-containing N-heterocycles. The metal-free novel approach for both N–H and C–H carbonylation processes was successfully refined, delivering a range of synthetically valuable derivatives of quinazoline-2,4(1H,3H)-dione, 2H-benzo[e] [1,2,4] thiadiazin-3(4H)-one 1,1-dioxide, and pyrrolo[1,2-a] quinoxalin-4(5H)-one. The protocol features
我们公开了一种使用异氰酸苯酯合成含羰基的N-杂环化合物的方法。N-H 和 C-H 羰基化过程的无金属新方法已成功精炼,提供了一系列具有合成价值的喹唑啉-2,4(1 H ,3 H )-二酮、2 H-苯并[ e ] [1,2,4] thiadiazin-3(4 H )-one 1,1-dioxide 和 pyrrolo[1,2 - a ] quinoxalin-4(5 H)-一。该协议具有广泛的底物,具有多种反应,适用于优异的产量、温和的条件和良好的官能团兼容性。此外,该反应的适用性以克级合成和药物分子的合成转化为特征。