Ethynylbenzenoid metabolites of <i>Antrodia camphorata</i>: synthesis and inhibition of TNF expression
作者:Marco Buccini、Kathryn A. Punch、Belinda Kaskow、Gavin R. Flematti、Brian W. Skelton、Lawrence J. Abraham、Matthew J. Piggott
DOI:10.1039/c3ob42333f
日期:——
Antrocamphin A and B, and (±)-epi-antrodioxolanone have been synthesised from a common precursor. Antrocamphin A displays anti-inflammatory activity but is also cytotoxic.
Selectivity in the Ruthenium-Catalyzed Alder Ene Reactions of Di- and Triynes
作者:Eun Jin Cho、Daesung Lee
DOI:10.1021/ja0719430
日期:2007.5.1
Ruthenium-catalyzed Alder enereactions between diynes and triynes with terminal alkenes gave the corresponding enynes and enediynes with high regio- and site-selectivity. The selectivity profile clearly indicates that one of the alkynyl moieties of 1,3-diynes not participating in the reaction determines the regiochemistry, whereas the interplay between steric hindrance and polar substituents at the
Synthesis of Selenium and Tellurium Core-Modified Azuliporphyrinogens and Benziporphyrinogens and Corresponding Carbaporphyrinoids
作者:Sohail Ahmad、Anchal Singhal、Kharu Nisa、S. M. S. Chauhan
DOI:10.1021/acs.inorgchem.8b00648
日期:2018.9.17
The synthesis of selenium and tellurium core-modified carbaporphyrinogens was carried out by the reaction of functional selenophene/tellurophene diols with azulene or a benzitripyrrane in the presence of acid. The products were obtained in moderate yields and were characterized by using 1H and 13C NMR, UV–vis, FT-IR, CV, and HRMS spectroscopic techniques. Further, oxidation of the obtained core-modified
硒和碲核心修饰的碳卟啉原的合成是在酸存在下,通过功能性硒烯/碲代二醇与和苯并三苯并吡喃反应进行的。产品以中等收率获得,并通过1 H和13 C NMR,UV-vis,FT-IR,CV和HRMS光谱技术进行了表征。此外,在DDQ存在下于CHCl 3中氧化获得的核心修饰的碳卟啉原,以良好的收率得到相应的碳卟啉。如通过使用质子NMR光谱法所证实的那样,苯并卟啉没有显示出环电流或大环芳族的迹象,但是TFA的加入引起了弱亲核指示的形成。
Electron depleted bis(methylene)cyclobutenes: sulfinyl and sulfonyl substitution
Double [2,3] sigmatropic rearrangements of bis(propargyl sulfenates) to bis(allenic sulfoxides) and of bis(propargyl sulfinates) to bis(allenicsulfones) are shown to be a convenient and effective method for the preparation of conjugated diallene systems bearing two electron withdrawing trihalomethyl sulfoxide or sulfone substituents either on C-1 and C-6, or on C-3 and C-4. Such substituents are further