Co(III)-Catalyzed Synthesis of Quinazolines via C-H Activation of N-Sulfinylimines and Benzimidates
C-H activation of arenes has been established as an important strategy for heterocycle synthesis via annulations between arenes and unsaturated coupling partners. However, nitriles failed to act as such a coupling partner. Dioxazolones have been employed as a synthon of nitriles, and subsequent coupling with arenes such as N-sulfinylimines and benzimidates bearing a functionalizable directing group provided facile access to two classes of quinazolines under Co(III)-catalysis.
Friedel-crafts-type alkylation with bromodifluoro(phenylsulfanyl)methane through α-fluorocarbocations: Syntheses of thioesters, benzophenones and xanthones
Bromodifluoro(phenylsulfanyl)methane undergoes a Friedel-Crafts-type alkylation, through α-fluorocarbocations, with activated aromatic compounds yielding thioesters and/or benzophenones. The methodology has been applied to the synthesis of naturally occurring xanthone derivatives.
Cross-coupling reactions of oxalyl chloride with organocopper reagents, derived from Grignard reagents, cuprous bromide, and lithium bromide, provide a simple and straightforward method for the synthesis of symmetrical α-diones in very good yields.
REACTIONS OF ORGANOMETALLIC COMPOUNDS, CATALYZED BY TRANSITION METAL COMPLEXES. 8. CARBONYLATION OF ARYLMERCURY COMPOUNDS IN THE PRESENCE OF PALLADIUM AND RHODIUM