Reaction of 1-bromoadamantane with diphenylphosphide and diphenylarsenide ions by the SRN1 mechanism. Facile nucleophilic substitution at the bridgehead position
Phosphides and arsenides as metal–halogen exchange reagents. Part 1. Dehalogenation of aliphatic dihalides
作者:Donal G. Gillespie、Brian J. Walker
DOI:10.1039/p19830001689
日期:——
yields of phosphorus-containing by-products. Similar reactions with 2,3-dichlorobuta-1,3-diene and 2-chlorobuta-1,3-diene give SN2′ rather than direct substitution products. Evidence is presented that adamantene is an initial product in the reaction of lithium diphenylphosphide with 1,2-di-iodo- and 1,2-dibromo-adamantane, but not with 1,2-dichloroadamantane, although 1- and 2-adamantyldiphenylphosphine
An enantioselective C−H arylation of phosphine oxides with o‐quinone diazides catalyzed by an iridium(III) complex bearing an atropchiral cyclopentadienyl (Cpx) ligand and phthaloyl tert‐leucine as co‐catalyst is reported. The method allows access to a) P‐chiral biaryl phosphine oxides, b) atropo‐enantioselective construction of sterically demanding biaryl backbones, and also c) selective assembly
Electrophilic Routes to Tertiary Adamantyl and Diamantyl Phosphonium Salts
作者:John Brown、Jasotha Prabagar、Andrew Cowley
DOI:10.1055/s-0030-1260303
日期:2011.10
In highly nonpolar media both 1-adamantyl and 1-diamantyl triflates are sufficiently stable to react with nucleophiles in a controlled manner. Several tertiary phosphonium triflate salts with a single adamantyl or diamantyl residue were prepared directly in this way, starting with the secondary phosphine. Three compounds with the 1-phosphodiamantane structure were characterised by X-ray.
A new protocol for the dearylation of arylphosphine oxides was developed using sodium hydride (NaH) in the presence of lithium iodide (LiI). The transient sodium phosphinite could be functionalized with a range of electrophiles in a one-pot fashion.
Synthesis of Several Halobisnoradamantane Derivatives and Their Reactivity through the S<sub>RN</sub>1 Mechanism
作者:Pelayo Camps、Andrés E. Lukach、Roberto A. Rossi
DOI:10.1021/jo010159+
日期:2001.8.1
corresponding substitution and reduction products by the S(RN)1 mechanism, while iodo ketone 17 gave a mixture of the rearranged substitution product 36 and the reduction product 18. Formation of 36 takes place through a 1,5-hydrogen migration of the initially formed radical, a kind of process that has been observed for the first time in the S(RN)1 propagation steps. The diiodo derivative 24 reacted with diphenylphosphide