Inter- and Intramolecular Radical Couplings of Ene-ynes or Halo-alkenes Promoted by an InCl<sub>3</sub>/MeONa/Ph<sub>2</sub>SiH<sub>2</sub> System
作者:Naoki Hayashi、Ikuya Shibata、Akio Baba
DOI:10.1021/ol051114o
日期:2005.7.1
(HInCl(2)) under nonacidic conditions is achieved by transmetalation between Ph(2)SiH(2) and InCl(2)OMe. The presented system achieves the titled coupling reactions in a radical manner. In particular, the nonacidic character enables the applications to acid-sensitive inter- and intramolecular ene-yne couplings.
Copper-Catalyzed Dicarbofunctionalization of Unactivated Olefins by Tandem Cyclization/Cross-Coupling
作者:Surendra Thapa、Prakash Basnet、Ramesh Giri
DOI:10.1021/jacs.7b01922
日期:2017.4.26
We present a strategy that difunctionalizes unactivated olefins in 1,2-positions with two carbon-based entities. This method utilizes alkyl/arylzinc reagents derived from olefin-tethered alkyl/aryl halides that undergo radical cyclization to generate C(sp3)-Cu complexes in situ, which are intercepted with aryl and heteroaryl iodides. A variety of (arylmethyl)carbo- and heterocycles (N, O) can be synthesized
The Reaction of Bis(dimethylglyoximato)(pyridine)cobalt(I), Cobaloxime(I), with 2-(Allyloxy)ethyl Halides and the Photolysis of the Resulting Organo-cobaloximes
作者:Masami Okabe、Masaru Tada
DOI:10.1246/bcsj.55.1498
日期:1982.5
The reactions of 2-(allyloxy)ethyl halides with cobaloxime(I) gave (tetrahydro-3-furanyl)methylcobaloximes via an electron transfer from cobaloxime(I) to the halides to give radical anions. The rupture of a halide ion to give an organic radical and the ring closure to give a (tetrahydro-3-furanyl)methylradical are followed by the radical coupling between the organic radical and the cobaloxime(II)
REACTION OF COBALOXIME(I), WITH 2-ALLYLOXYETHYL HALIDES. EVIDENCE FOR AN ELECTRON TRANSFER MECHANISM
作者:Masaru Tada、Masami Okabe
DOI:10.1246/cl.1980.201
日期:1980.2.5
Reaction of Cobaloxime(I), (CoI)− , with 2-allyloxyethyl halides (1, 2, and 3) gave cyclized organocobaloximes (5) formed by intramolecularrearrangement of 2-allyloxyethyl radicals to (3-tetrahydrofuranyl)methyl radicals. The intermediate radical must be formed by an electron transfer process which competes with an SN2 reaction to give a non-cyclized organocobaloximes.
Stereocontrol in radical cyclization: Stereoselective synthesis of 2,4-cis and 2,4-trans tetrahydrofuran derivatives via mono- or dichloromethyl radical.
作者:Yoshihiko Watanabe、Takeshi Endo
DOI:10.1016/s0040-4039(00)80085-4
日期:1988.1
A novel stereocontrol method for the preparation of 2,4-disubstituted tetrahydrofurans was presented. 2,4-Cis-disubstituted-3,3-dichlorotetrahydrofurans were provided predominantly by the radicalcyclization of allyl-2,2,2-trichloroethylethers with tributyltin hydride. The effect of geometry of chlorine atom and olefin on products stereochemistry was also discussed.