Search results for "Aryne"
showing 4 items of 24 documents
Neue Diels-Alder-Reaktionen von 1-Methylpyrano[3,4-b]indol-3(9H)-on mit cyclischen CC-Dienophilen: ein einfacher Zugang zu [b]anellierten Carbazol-De…
1988
1-Methylpyrano[3,4-b]indol-3(9H)-on (1) reagiert als synthetisches Aquivalent von Indolo-2,3-chinodimethan mit Arin, p-Benzochinon und p-Naphthochinon zu neuen [b]anellierten Carbazol-Derivaten. Durch das Reaktionsmedium bedingt lassen sich bei der Cycloaddition von 1 mit Arin zugleich auch mononitrierte Carbazole isolieren. New Diels-Alder Reactions of 1-Methylpyrano[3,4-b]indol-3(9H)-one with Cyclic CC-Dienophiles: A Simple Way to [b]Annulated Carbazole Derivatives. 1-Methylpyrano[3,4-b]indol-3-(9H)-one (1) reacts as synthetic equivalent of indolo-2,3-quinodimethane with benzyne, p-benzoquinone, and p-naphthoquinone to give new [b]annulated carbazole derivatives. In the Diels-Alder reacti…
Evidence for the formation of 1,3- and 1,4-dehydrobenzenes in the thermal decomposition of diaryliodonium-carboxylates
1986
Abstract Abstract: Generation of m- and p-benzynes in decomposition of diaryliodonium- 3- and 4-carboxylates is demonstrated by three-phase method.
ChemInform Abstract: Efficient Synthesis of Quaternary and P-Stereogenic Phosphonium Triflates.
2010
An efficient and general method for the preparation of achiral and chiral phosphonium salts is reported. This synthesis is based on the quaternization of phosphines and their derivatives with arynes generated in situ from 2-(trimethylsilyl)aryl triflates. This methodology is successfully applied to the synthesis of new valuable P-stereogenic phosphonium triflates.
Designing P-Chirogenic 1,2-Diphosphinobenzenes at Both P-Centers Using P(III)-Phosphinites
2016
International audience; A new enantiodivergent synthesis of P-chirogenic 1,2-diphosphinobenzenes (DP*B) bearing the chirality on one or both phosphorus centers is reported using aryne chemistry. The principle is based on successive reactions of 1,2-dibromobenzene with sec-phosphide boranes, then DABCO to remove the borane, and finally with chlorophosphines or P(III)-chirogenic phosphinites. The efficiency of this synthesis was demonstrated by the stereoselective preparation of (S,S)-1,2-bis(o-anisylphenylphosphino)benzene. A comparison of DIPAMP and homochiral DP*B ligands in asymmetric Rh- or Pd-catalyzed reactions was reported.