Benzyne-induced ring opening reaction of thiiranes. Efficient synthesis of phenyl vinyl sulfides
作者:Juzo Nakayama、Satoshi Takeue、Masamatsu Hoshino
DOI:10.1016/s0040-4039(01)81261-2
日期:1984.1
A series of thiiranes react with benzyne to provide an efficient synthesis of phenyl vinyl sulfides. The reaction is stereospecific, thus producing cis-(phenylthio)-stilbene from cis-2,3-diphenylthiirane and trans-(phenylthio)stilbene from trans-2,3-diphenylthiirane.
One-pot dialkylation of allylphenylsulfide induced by aminoalkoxides-activated NaNH2. Application to the synthesis of unsymmetrical ketones
作者:Sabine Choppin、Philippe Gros、Yves Fort
DOI:10.1016/s0040-4020(99)00481-0
日期:1999.7
aminoalkoxides, leading to new superbases, induced an efficient one-pot dialkylation of allylphenylsulfide. The regioselectivity of the reaction (α,α′ vs α,γ) was found as strongly dependent on the nature of the alkyl halide. As an application, α,γ dialkylated products were efficiently converted into the corresponding unsymmetrical ketones.
A novel carbonylative addition of thiols (RSH) to terminal acetylenes (R′–CCH) takes place successfully in the presence of platinum catalysts under the pressure of carbonmonoxide, providing α,β-unsaturated thioesters (R′–C(C(O)SR)CH2) in good yields regioselectively. This ‘hydrothiocarbonylation’ reaction of acetylenes may include the formation of the platinum sulfide complex as key species.
A new oxapalladacycle generated via ortho C–H activation of phenylphosphinic acid: an efficient catalyst for Markovnikov-type additions of E–H bonds to alkynes
作者:Qing Xu、Ruwei Shen、Yutaka Ono、Ritsuko Nagahata、Shigeru Shimada、Midori Goto、Li-Biao Han
DOI:10.1039/c0cc03436c
日期:——
A new oxapalladacycle 3 can be conveniently prepared via direct ortho palladation of diphenylphosphinic acid with palladium acetate. Catalysts derived from 3 can efficiently catalyze Markovnikov-type additions of EâH bonds (P(O)âH, SâH and spCâH) to alkynesvia a unique catalytic cycle.
Abstract The radical reaction of benzenethiol with alkynes 1a-o carried out at 154 °C affords a mixture of thiol/alkyne adduct 3 and benzothiophene 5, deriving from vinyl radical intermediates 2 through hydrogen abstraction and 5-(π-endo)orthocyclization onto the adjacent thiophenyl ring, respectively. This latter reaction occurs through the reversible formation of cyclohexadienyl radical intermediates