- Regioselective Diboron-Mediated Semireduction of Terminal Allenes
-
A method for the regioselective reduction of the terminal double bond of 1,1-disubstituted allenes has been developed. In the presence of a palladium catalyst, tetrahydroxydiboron and stoichiometric water, allene semireduction proceeds in high yield to afford Z-alkenes selectively.
- Gates, Ashley M.,Santos, Webster L.
-
p. 4619 - 4624
(2019/12/11)
-
- An efficient method for the synthesis of alkylidenecyclobutanones by gold-catalyzed oxidative ring enlargement of vinylidenecyclopropanes
-
Rings of gold: Vinylidenecyclopropanes can undergo efficient oxidative ring enlargements under mild conditions to give the corresponding alkylidenecyclobutanone derivatives in good yields (see scheme). A plausible mechanism for this transformation has bee
- Yuan, Wei,Dong, Xiang,Wei, Yin,Shi, Min
-
p. 10501 - 10505
(2012/11/13)
-
- A catalytic method for the preparation of polysubstituted cyclopentanes: [3+2] cycloaddition of vinylidenecyclopropanes with activated olefins catalyzed by triflic imide
-
[3+2] Cycloadditions of vinylidenecyclopropanes (VDCPs) with electron-deficient olefins, such as methyl vinyl ketone (MVK) and acrylaldehyde, proceed smoothly in the presence of a catalytic amount of triflic imide (Tf2NH) to give the corresponding functio
- Li, Wei,Shi, Min
-
supporting information; scheme or table
p. 856 - 860
(2009/06/20)
-
- Palladium-catalyzed coupling reactions of diarylvinylidenecyclopropanes with 2-iodophenol and N-(2-iodophenyl)-4-methylbenzenesulfonamide
-
A palladium-catalyzed cross-coupling reaction of diarylvinylidenecyclopropanes with 2-iodophenol and N-(2-iodophenyl)-4- methylbenzenesulfonamide provided a variety of cyclopropane-containing 2,2-diaryl-3-tetramethylcyclopropylidene-2,3-dihydrobenzofuran
- Li, Wei,Shi, Min
-
supporting information; scheme or table
p. 270 - 274
(2009/06/21)
-
- Bronsted acid TfOH-mediated [3 + 2] cycloaddition reactions of diarylvinylidenecyclopropanes with nitriles
-
(Chemical Equation Presented) Diarylvinylidenecyclopropanes undergo a [3 + 2] cycloaddition reaction with MeCN in the presence of Bronsted acid TfOH to give the corresponding 3,4-dihydro-2H-pyrrole derivatives 2 in moderate to excellent yields under reflu
- Li, Wei,Shi, Min
-
p. 4151 - 4154
(2008/09/21)
-
- Photocyclization between Quinones and Allenes via Photoinduced Electron Transfer
-
Photochemical reactions of halo-1,4-naphthoquinones with 1,1-diphenylallenes afforded spiropyran adducts derived from cycloaddition between carbonyl group of quinone and allene in good yield.In the photoreactions of 2,3-dichloro-1,4-naphthoquinone with monophenylallenes, cycloadducts were obtained in addition to spiropyran derivatives.Considering the relationship between formation of spiropyran adducts and the free energy changes (ΔG) together with substituent effects, solvent effects, and CIDNP (chemically induced dynamic nuclear polarization), we propose an electron-transfer mechanism.That is, radical ion pair formation from excited triplet quinone and allene is followed by conversion to a biradical.Subsequent bond formation between the ketyl radical in quinone moiety and ortho position of the phenyl substituents on the allene skeleton leads to the spiropyran adduct after subsequent 1,5-hydrogen shift.
- Maruyama, Kazuhiro,Imahori, Hiroshi
-
p. 2692 - 2702
(2007/10/02)
-