Manganese-Catalyzed Borylation of Unactivated Alkyl Chlorides
作者:Thomas C. Atack、Silas P. Cook
DOI:10.1021/jacs.6b03157
日期:2016.5.18
of (bis)pinacolatodiboron with a wide range of alkyl halides, demonstrating the first manganese-catalyzed coupling with alkyl electrophiles. This method allows access to primary, secondary, and tertiary boronic esters from the parent chlorides, which were previously inaccessible as coupling partners. The reaction proceeds in high yield with as little as 1000 ppm catalyst loading, while 5 mol % can
Use of high pressure in the reduction of organic chlorides with tri-n-butyltin hydride
作者:A. Rahm、R. Amardeil、M. Degueil-Castaing
DOI:10.1016/0022-328x(89)85216-7
日期:1989.7
pressure technique enables reduction of organic halides by tri-n-butyltinhydride to be carried out in the absence of a catalyst or free radical initiator. It leads to a better conservation of the structure of the starting material during the reduction. In the case of some unsaturated halides, a new chemoselectivity has been observed in favour of the addition of the hydride on the carboncarbon double
Cobalt-Catalyzed Chelation-Assisted Alkylation of Arenes with Primary and Secondary Alkyl Halides
作者:Naohiko Yoshikai、Ke Gao、Takeshi Yamakawa
DOI:10.1055/s-0033-1338658
日期:——
center to the alkylhalide to form the corresponding alkyl radical, which has a finite lifetime before it undergoes C–C bond formation. Cobalt–N-heterocyclic carbene catalytic systems have been developed for chelation-assisted ortho-alkylation of aromatic compounds with alkylhalides. Aryl imines can be selectively monoalkylated at room temperature by various primary or secondary alkyl chlorides or
Efficient conversion of alkyl chlorides into bromides
作者:K. B. Yoon、J. K. Kochi
DOI:10.1039/c39870001013
日期:——
The convenient and selective catalytic conversion of secondary and tertiary alkylchlorides into bromides with hydrogen bromide in the presence of small amounts of anhydrous iron(III) bromide is described.
作者:Terence C. Morrill、Qingyi Lu、Aubrey Brister、Brian O'Shaughnessy、Kevin Belfield
DOI:10.1055/s-1993-25983
日期:——
Transmercuration of tri-exo-2-norbornylborane followed by chlorinolysis of the resultant organoborane is a low yield (≤5%) method of producing exo-2-norbornyl chloride. The primary source of this low yield is the ≤ inefficient transmercuration of the sterically restricted organoborane. Yields of alkyl halide are substantially higher (up to 63%) when the organoborane undergoes direct chlorinolysis promoted by boron trichloride. Even higher yields (approaching 80%) are obtained when brominolysis of the organoborane is carried out. Controls suggest that at least part of the reason for the higher yield with bromine is due to the greater stability of the product under the reaction conditions. Despite the general retention aspects (exo-borane gives largely exo-halide) of these halogenolyses, deuterium labeling studies show that these reactions are accompanied by substantial Wagner-Meerwein rearrangement, very possibly due to boron trihalide induced rearrangement of the norbornyl halide product.