Ethynylbenziodazolones (EBZ) as Electrophilic Alkynylation Reagents for the Highly Enantioselective Copper‐Catalyzed Oxyalkynylation of Diazo Compounds
radicals and nucleophiles, yet they present limited possibilities for further structure and reactivity modification. Herein, the first synthesis is reported for the corresponding ethynylbenziodazolone (EBZ) reagents, in which the oxygen atom in the iodoheterocycle is replaced by a nitrogen atom. The substituent on the nitrogen enables further fine‐tuning of the reagent structure and reactivity. EBZ reagents
Convenient Synthesis of Vinyldiazomethanes from α-Diazo-β-Keto Esters and Related Systems
作者:Huw M. L. Davies、Paul W. Hougland、William R. Cantrell
DOI:10.1080/00397919208019285
日期:1992.4
Abstract A series of vinydiazomethanes were readily prepared by sodiumborohydridereduction of a-diazo-p-ketoesters followed by phosphorusoxychloride induced dehydration of the resulting a-diazo-p-hydroxyesters.
Synthesis and Chemistry of Donor/Acceptor-Substituted Cyclopropenes
作者:Huw M. L. Davies、Jeffrey H. Houser、Craig Thornley
DOI:10.1021/jo00128a027
日期:1995.11
Rhodium(II) acetate, or trifluoroacetate-catalyzed decomposition of 1-diazo-2-(trialkylsiloxy)propenes with electron-withdrawing groups at the 1-position results in the formation of highly reactive cyclopropenes. These cyclopropenes contain both donor and acceptor substituents on the alkene and are very susceptible to ring opening and fragmentation reactions, Nevertheless, when appropriately functionalized with bulky substituents they can be of sufficient stability to be isolated and characterized.