Catalytic Phosphorus(V)-Mediated Nucleophilic Substitution Reactions: Development of a Catalytic Appel Reaction
作者:Ross M. Denton、Jie An、Beatrice Adeniran、Alexander J. Blake、William Lewis、Andrew M. Poulton
DOI:10.1021/jo201085r
日期:2011.8.19
from stoichiometric waste products into catalysts and a new concept for catalytic phosphorus-based activation and nucleophilicsubstitution of alcohols has been validated. The present study has focused on a full exploration of the scope and limitations of phosphine oxide catalyzed chlorination reactions as well as the development of the analogous bromination reactions. Further mechanistic studies, including
Hydrolytic selenoxide elimination reaction for the preparation of 2-chloro-1-olefins
作者:Lars Engman
DOI:10.1016/s0040-4039(00)95954-9
日期:——
from terminal olefins by a sequence involving Markownikoff-addition of PhSeCl, chlorination of the resulting β-chloroalkyl phenyl selenides with SO2Cl2 and, after recrystallization, hydrolysis/selenoxideelimination in a two-phase system.
Ruthenium-catalyzed transformation of alkenyl triflates to alkenyl halides
作者:Eiji Shirakawa、Yusuke Imazaki、Tamio Hayashi
DOI:10.1039/b907761h
日期:——
In the presence of a ruthenium catalyst, alkenyl triflates were found to be transformed to the corresponding bromides, chlorides and iodides simply by treatment with a lithium halide (1.2 equiv.).
Fe(III) Halides as Effective Catalysts in Carbon−Carbon Bond Formation: Synthesis of 1,5-Dihalo-1,4-dienes, α,β-Unsaturated Ketones, and Cyclic Ethers
作者:Pedro O. Miranda、David D. Díaz、Juan I. Padrón、Miguel A. Ramírez、Víctor S. Martín
DOI:10.1021/jo048410j
日期:2005.1.1
homopropargylic alcohols were used, a Prins-typecyclization occurred yielding 2-alkyl-4-halo-5,6-dihydro-2H-pyrans. In addition, anhydrous ferric halides are also shown to be excellent catalysts for the standard Prins cyclization with homoallylic alcohols. Isolation of an intermediate acetal, calculations, and alkyne hydration studies provide substantiation of a proposed mechanism.
A Chlorinating Reagent Yields Vinyl Chlorides with High Regioselectivity under Heterogeneous Gold Catalysis
作者:Shengzong Liang、Rene Ebule、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.orglett.7b02101
日期:2017.9.1
A novel chlorinatingreagent with a high concentration of HCl has enabled the highly regioselective hydrochlorination of unactivated alkynes using a commercial nanogold catalyst. No overchlorination or hydration products were formed, and various functional groups were tolerated. This hydrochlorination method could be conducted under open air.