Symmetrical Bisquinolones via Metal-Catalyzed Cross-Coupling and Homocoupling Reactions
作者:Jamshed Hashim、Toma N. Glasnov、Jennifer M. Kremsner、C. Oliver Kappe
DOI:10.1021/jo052283p
日期:2006.2.1
Functionalized 4,4‘-bisquinolones can be efficiently synthesized by microwave-assisted palladium(0)-catalyzed one-pot borylation/Suzukicross-coupling reactions or via nickel(0)-mediated homocouplings of 4-chloroquinolin-2(1H)-one precursors. Both methods are also applicable to other types of symmetrical biaryls.
4-Cyano-6,7-dimethoxycarbostyrils with Solvent- and pH-Independent High Fluorescence Quantum Yields and Emission Maxima
作者:Appasaheb B. Ahvale、Hana Prokopcová、Jana Šefčovičová、Waltraud Steinschifter、Anna E. Täubl、Georg Uray、Wolfgang Stadlbauer
DOI:10.1002/ejoc.200700855
日期:2008.1
solvents in a narrow 430–440-nm window with almost constant quantumyield of 0.5. Equal excitation is possible in the broad double maximum between 385 and 410 nm yielding identical data between pH 1 and 11. These properties could lead to a broadly usable fluorescence standard. N-Alkylation with bromoacetate yields ester 13 in good yields. Reactive succinimidoyl (OSu) ester 15 was prepared by saponification