Electron ionization-induced fragmentation ofN- andO-alkoxymethylated carbostyril and phenanthridinone
作者:Rafał Szmigielski、Witold Danikiewicz
DOI:10.1002/jms.652
日期:2004.7
mechanism for O-alkoxymethylated compounds. Another important fragmentation common for all studied compounds is the loss of an alkyl radical from N- and O-alkoxymethyl groups, yielding the appropriate stable isomeric cations, which, according to the results of the further fragmentation, undergo fast equilibration reaction via an ion–neutral complex. This process is accompanied by the unusually high kinetic
A palladium reagent prepared from Pd (OAc)(2) (0.2 eq) and n-Bu3P (0.6 eq) catalyzed an aryl-aryl coupling reaction. This procedure is effective for coupling reactions of aryl triflate possessing no oxygen groups with arene, and of aryl iodide with arene.
Synthesis of trisphaeridine and norchelerythrine through palladium-catalyzed aryl–aryl coupling reaction
Total syntheses of trisphaeridine (3)
and norchelerythrine (4), fully
aromatized phenanthridine and benzo[c]phenanthridine alkaloids, were
accomplished via the internal arylâaryl coupling reaction of
halo amides protected by a methoxymethyl group with the palladium reagent,
followed by reduction with lithium aluminium hydride and treatment with hydrochloric
acid.