9-Silafluorenes via Base-Promoted Homolytic Aromatic Substitution (BHAS) – The Electron as a Catalyst
作者:Dirk Leifert、Armido Studer
DOI:10.1021/ol503574k
日期:2015.1.16
Transition-metal-free intramolecular radicalsilylation of 2-diphenylsilylbiaryls via base-promoted homolytic aromatic substitution (BHAS) to give 9-silafluorenes is reported. 2-Diphenylsilylbiaryls are readily prepared, and cross dehydrogenativesilylation occurs with tert-butylhydroperoxide (TBHP) as a cheap stoichiometric oxidant in the presence of a small amount of tetrabutylammonium iodide (TBAI)
A visible‐light inducedradicalsilylation to dibenzosiloles from biarylhydrosilanes is described. The products were obtained in satisfactory yields under mild and water/air compatible conditions, providing an efficient and practical method for the synthesis of difunctionalized siloles by using a cheap organic dye photocatalyst. The method is tolerated by a wide range of functional groups and has a
Regioselectivity of photochemical annulations of chromium carbene complexes
作者:Craig A. Merlic、W.Michael Roberts
DOI:10.1016/s0040-4039(00)60130-2
日期:1993.11
The regioselectivity of photochemical benzannulation reactions of chromium biarylcarbene complexes is reported. Excellent selectivity is observed in furyl- and naphthyl-substituted substrates. Interesting ortho verses para selectivity is found in meta substituted (biphenyl)carbene substrates.
Palladium Catalyzed C–I and Vicinal C–H Dual Activation of Diaryliodonium Salts for Diarylations: Synthesis of Triphenylenes
作者:Xunshen Wu、Jianwei Han、Limin Wang
DOI:10.1021/acs.joc.7b01905
日期:2018.1.5
we report an approach for direct diarylations of 2-bromobiphenyls or bromobenzenes. As a result, a wide range of triphenylenes with various substituents have been synthesized in good yields. These triphenylenes are expected to be employed in the “bottom-up” synthesis of functional aromatic molecules in material science.
Described are compounds of the formula (I) which are orally active and bind to aspartic proteases to inhibit their activity. They are useful in the treatment or amelioration of diseases associated with aspartic protease activity. Also described are methods of use of the compounds described herein in ameliorating or treating aspartic protease related disorders in a subject in need thereof.