Electrochemical oxidation synergizing with Brønsted-acid catalysis leads to [4 + 2] annulation for the synthesis of pyrazines
作者:Kun Liu、Chunlan Song、Jiarong Wu、Yuqi Deng、Shan Tang、Aiwen Lei
DOI:10.1039/c8gc03786h
日期:——
Electrochemical oxidative [4 + 2] annulation for the synthesis of pyrazines.
电化学氧化[4 + 2]环化合成吡嗪。
Photochemical (Hetero-)Arylation of Aryl Sulfonium Salts
作者:Yue Zhao、Congjun Yu、Wenjing Liang、Frederic W. Patureau
DOI:10.1021/acs.orglett.1c01904
日期:2021.8.20
report a simple photoinduced and catalyst-free C–H/C–H (hetero)arylation cross-coupling through aryl thianthrenium salts, which are formed site-selectively by direct C–H functionalization. The key to this approach is the UV-light, which can disrupt the C–S bond to form thianthrene radical cations and aryl radicals.
Inherent vs Apparent Chemoselectivity in the Kumada–Corriu Cross-Coupling Reaction
作者:XiYe Hua、Jeanne Masson-Makdissi、Ryan J. Sullivan、Stephen G. Newman
DOI:10.1021/acs.orglett.6b02631
日期:2016.10.21
The Kumada–Corriu reaction is a powerful tool for C–C bond formation, but is seldom utilized due to perceived chemoselectivity issues. Herein, we demonstrate that high-yielding couplings can occur in the presence of many electrophilic and heterocyclic functional groups. Our strategy is mechanically based, matching oxidative addition rates with the rate of syringe pump addition of the Grignard reagent
Iron-catalyzed Cross-Coupling of Electron-Deficient Heterocycles and Quinone with Organoboron Species via Innate C–H Functionalization: Application in Total Synthesis of Pyrazine Alkaloid Botryllazine A
作者:Parvinder Pal Singh、Sravan Kumar Aithagani、Mahipal Yadav、Varun Pratap Singh、Ram A. Vishwakarma
DOI:10.1021/jo302797r
日期:2013.3.15
innate C–H functionalization. Iron(II) acetylacetonate along with oxidant (K2S2O8) and phase-transfer catalyst (TBAB) under open flask conditions efficiently catalyzed the cross-coupling of pyrazine with arylboronicacids and gave monoarylated products in good to excellent yields. Optimized conditions also worked for other heterocylces such as quinoxalines, pyridines, quinoline, and isoquinoline as
Pharmaceutical compositions for enhancing the expression of apoAI are provided, which are used as medicaments for treatment of cardiovascular diseases on the basis of improving the functions of HDL.
Pharmaceutical compositions for enhancing the expression of apoAI which comprises a compound of formula (I):
in which X
1
and X
1
are independently an aryl or heteroaryl that may be optionally substituted, a hydrogen, a halogen, or the like; ring A is a benzene ring or 6-membered aromatic heterocyclic ring containing 1 to 3 N atoms that may be optionally condensed with another aromatic ring; R
1
to R
4
are independently a hydrogen, a halogen, a lower alkyl, a lower alkoxy or the like; a prodrug thereof, a pharmaceutically acceptable salt or solvate of them are disclosed.