Bis-Sulfonyl Ethylene as Masked Acetylene Equivalent in Catalytic Asymmetric [3 + 2] Cycloaddition of Azomethine Ylides
作者:Ana López-Pérez、Javier Adrio、Juan C. Carretero
DOI:10.1021/ja804021m
日期:2008.8.1
synthesized by highly enantioselective Fesulphos-Cu-catalyzed 1,3-dipolar cycloaddition of azomethineylides with trans-1,2-bisphenylsulfonyl ethylene, followed by reductive sulfonyl elimination. High levels of reactivity, exoselectivity, and enantioselectivity have been accomplished for a variety of substituted azomethineylides. This cycloaddition-desulfonylation strategy has been applied as a key step in the
We report the atom-economic and environmentally friendly synthesis of Z-β-sulfonyl-a,β-unsaturatedcarbonylcompounds in water. The mechanism study reveals that the hydrosulfonylation of alkynylcarbonyl compounds with sulfinic acids proceeds via a mechanism that features a sulfinic acid molecule protonating an alkynyl motif to form the ethenium intermediate, which subsequently reacted with a sulfonyl
In this article, the synthesis and characterization of new palladium(η2‐olefin) complexes bearing isocyanides as spectator ligands are described. These derivatives have been tested on olefin exchange reactions, allowing to define a scale of strength of the palladium(0)‐olefin bond. In this way we have proved that dimethyl fumarate can be released by the metal center much more easily than the other
Preparation and reactivity of arylsulfonyl substituted cyclopropenes
作者:Albert Padwa、M. Woods Wannamaker
DOI:10.1016/s0040-4020(01)86547-9
日期:1991.8
behavior of several arylsulfonyl substituted alkynes with 2-diazopropane has been carried out. These activated acetylenes react to give 3H-pyrazoles which extrude nitrogen on photolysis to produce cyclopropenes in high yield. Soft nucleophiles such as thiophenoxide readily add to the activated pi-bond to give thiophenyl substituted cyclopropanes. Reaction of 1-phenylsulfonyl-2,3,3-trimethylcyclopropene
Reactivity of phenyliodonium bis(arylsulphonyl)methylides towards alkenes and alkynes: crystal structure of 9-phenylsulphonyl-1,2,3,4,4a,9a-hexahydro-1,4- methanofluorene
作者:Lazaros Hatjiarapoglou、Anastassios Varvoglis、Nathaniel W. Alcock、Graham A. Pike
DOI:10.1039/p19880002839
日期:——
Thermal or photochemical reactions of phenyliodonium bis(arylsulphonyl)methylides with alkenes lead normally to gem-(arylsulphonyl)cyclopropanes. Norbornene and trans-stilbene, however, afford 1-(phenylsulphonyl)indane derivatives. The crystal structure of the title compound R= 0.038 for 3 468 unique observed reflections [I/σ(I) 3.0]} confirmed the identity of the product with norbornene. Diarylacetylenes