Oxidative Cleavage of Alkenes Using an In Situ Generated Iodonium Ion with Oxone as a Terminal Oxidant
摘要:
A facile and operationally convenient catalytic procedure for oxidative cleavage of alkenes is described. In situ formed [hydroxy(4-carboxyphenyl)iodonium]ion, 2, from the oxidation of 4-iodobenzoic acid, 1, has been shown to facilitate the cleavage of a variety of alkenes in presence of Ozone as a co-oxidant. Optimization of the reaction conditions using 1-phenyl-1-cyclohexene, 3, and the competitive oxidative cleavage of different substrates using the optimized conditions has uncovered important mechanistic details of the reaction.
Starting from cyclic diaryliodoniums and terminal alkenes, a diverse set of fluorenes is conveniently constructed. The reactions catalyzed by palladium undergo one conventional Mizoroki‐Heckreaction and one reductive Heckreaction. The scope of alkenes is general, leading to 29 fluorenes which would expand the structural diversity of fluorene reservoir.
Synthesis of 9-Fluorenylidenes and 9,10-Phenanthrenes through Palladium-Catalyzed Aryne Annulation by <i>o</i>-Halostyrenes and <i>o</i>-Halo Allylic Benzenes
作者:Shilpa A. Worlikar、Richard C. Larock
DOI:10.1021/jo9017827
日期:2009.12.4
A number of functionally substituted 9-fluorenylidenes and 9,10-phenanthrenes have been synthesized from substituted o-halostyrenes and o-halo allylic benzenes respectively in good yields by the palladium-catalyzed annulation of arynes. The methodology tolerates a variety of functional groups, including cyano, ester, aldehyde, and ketone groups, occurs Under relatively mild reaction conditions, and involves the generation of two new carbon-carbon bonds, thus providing these important carbocyclic ring systems in a single synthetic step.
Sieglitz; Jassoy, Chemische Berichte, 1921, vol. 54, p. 2138
作者:Sieglitz、Jassoy
DOI:——
日期:——
ESTERIFICATION OF AMINO ACIDS AND MONO ACIDS USING TRIPHOSGENE
作者:I. A. Rivero、S. Heredia、A. Ochoa
DOI:10.1081/scc-100104468
日期:2001.1.1
Alkyl esters of several amino acids and acids were prepared using triphosgene [t richloromethyl carbonate, TPA (2)].
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