Palladium-Catalyzed Direct Synthesis of Phosphole Derivatives from Triarylphosphines through Cleavage of Carbon-Hydrogen and Carbon-Phosphorus Bonds
作者:Katsuaki Baba、Mamoru Tobisu、Naoto Chatani
DOI:10.1002/anie.201307115
日期:2013.11.4
(Phosp)hole in one: A palladium‐catalyzed synthesis for directly assembling phosphole skeletons fromtriarylphosphinesthrough CH and CP bond cleavage was developed. This approach overcomes several of the limitations of the so far reported methods. Phospholes bearing a range of functionalities (including Br, F, CO2Me, Ac, and CN) and an array of fused rings (naphthalenes, anthracenes, furans, and
在一个(Phosp)孔:一个钯催化合成的用于从至C三芳基膦直接组装磷杂环骨架 H和13 C P键裂解被开发。这种方法克服了迄今为止报道的方法的一些局限性。可以容易地合成具有一系列功能性(包括Br,F,CO 2 Me,Ac和CN)的磷脂和一系列稠环(萘,蒽,呋喃和吡咯)。
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
Rhodium‐Catalyzed Synthesis of Chiral Monohydrosilanes by Intramolecular C−H Functionalization of Dihydrosilanes
作者:Wenpeng Ma、Li‐Chuan Liu、Kun An、Tao He、Wei He
DOI:10.1002/anie.202013041
日期:2021.2.19
The preparation of chiral monohydrosilanes remains a rarely achieved goal. To this end a Rh‐catalyzed desymmetrization of dihydrosilanes by way of intramolecular C(sp2)−H functionalization under simple and mild conditions has now been developed. This method provides easy access to a broad range of chiral monohydrosilanes in good yields with excellent enantioselectivities (up to >99 % ee). The resulting
for the preparation of dibenzosiloles was developed through intramolecular C−H/Si−H dehydrogenative coupling strategy starting from biarylhydrosilanes. Both electro-donating and electro-withdrawing substitution groups were tolerated for this transformation, and the desired dibenzosilole products could be obtained in moderate to excellent yields. A sila-Friedel-Crafts reaction mechanism was proposed