Facile Preparation of 3,4-Benzocoumarins from 2-Arylbenzoic Acids with NCS and Nai
摘要:
Treatment of 2-arylbenzoic acids with N-chlorosuccinimide (NCS) and NaI at 70 degrees C under fluorescent lighting condition gave the corresponding 3,4-benzocoumarins in good yields under transition-metal-free condition. It was found that the reactivity of NCS with NaI for the formation of 3,4-benzocoumarins from 2-arylbenzoic acids was as high as that with NIS. Thus, the formation of carboxyl radicals and their cyclization onto an aromatic ring from 2-arylbenzoic acids with much less expensive NCS and NaI, than NIS could be successfully carried out to form 3,4-benzocoumarins.
Non-steroidal compounds which are high affinity, high selectivity modulators for steroid receptors are disclosed. Also disclosed are pharmaceutical compositions incorporating such compounds, methods for employing the disclosed compounds and compositions for treating patients requiring steroid receptor agonist or antagonist therapy, intermediates useful in the preparation of the compounds and processes for the preparation of the steroid receptor modulator compounds.
Cerium photocatalyzed dehydrogenative lactonization of 2-arylbenzoic acids
作者:Ketan Wadekar、Suraj Aswale、Veera Reddy Yatham
DOI:10.1039/c9ob02676b
日期:——
The first cerium photocatalyzed dehydrogenative lactonization of 2-arylbenzoic acids has been developed. This operationally simple protocol allows rapid access to synthetically useful coumarins on gram scale by employing CeCl3 as a photocatalyst and O2 as a terminal oxidant. Overall, this delivers an economical and environmentally amiable entry to diversely substituted coumarins, important structural
Tricyclic steroid receptor modulator compounds and methods
申请人:Ligand Pharmaceuticals Incorporated
公开号:US05696130A1
公开(公告)日:1997-12-09
Non-steroidal compounds which are high affinity, high selectivity modulators for steroid receptors are disclosed. Also disclosed are pharmaceutical compositions incorporating such compounds, methods for employing the disclosed compounds and compositions for treating patients requiring steroid receptor agonist or antagonist therapy, intermediates useful in the preparation of the compounds and processes for the preparation of the steroid receptor modulator compounds.
General and Practical Carboxyl-Group-Directed Remote CH Oxygenation Reactions of Arenes
作者:Yang Wang、Anton V. Gulevich、Vladimir Gevorgyan
DOI:10.1002/chem.201303511
日期:2013.11.18
Two methods for remote aromatic CHoxygenationreactions, have been developed. Method 1, the Cu‐catalyzed oxygenationreaction, is highly efficient for cyclization of electron‐neutral and electron‐rich biaryl carboxylic acids into 3,4‐benzocoumarins. Method 2, the K2S2O8‐mediated oxygenationreaction, is more general and practical for cyclization of substrates with electron‐donating and ‐withdrawing
已经开发了两种用于远程芳族 C H 氧化反应的方法。方法 1,即 Cu 催化的氧化反应,对于将电子中性和富电子的联芳基羧酸环化为 3,4-苯香豆素非常有效。方法 2,K 2 S 2 O 8介导的氧化反应,对于具有给电子和吸电子基团的底物的环化更为通用和实用(见方案)。
Palladium-Catalyzed Direct Annulation of Benzoic Acids with Phenols to Synthesize Dibenzopyranones
作者:Yang Wang、Jie-Yu Gu、Zhang-Jie Shi
DOI:10.1021/acs.orglett.7b00177
日期:2017.3.17
Direct annulation of benzoic acids with phenols via palladium-catalyzed oxidative coupling is reported. Readily available and inexpensive starting materials were used in this novel method to synthesize highly valuable and useful dibenzopyranone scaffolds. Broad substrate scope and simple operation make this method potentially practical. Preliminary mechanistic studies were conducted to understand this