Radical-Mediated Strategies for the Functionalization of Alkenes with Diazo Compounds
作者:Yong-Liang Su、Geng-Xin Liu、Jun-Wen Liu、Linh Tram、Huang Qiu、Michael P. Doyle
DOI:10.1021/jacs.0c05183
日期:2020.8.12
reported. Here we report a novel reaction of diazo compounds utilizing a radical-mediated addition strategy to achieve difunctionalization of diverse alkenes. Diazo compounds are transformed to carbon radicals with a photocatalyst or an iron catalyst through PCET processes. The carbon radical selectively adds to diverse alkenes delivering new carbon radical species, then forms products through hydroalkylation
mild visible light-induced palladium-catalyzed alkyl Heckreaction of diazo compounds and N-tosylhydrazones is reported. This method features Brønsted acid assisted generation of hybrid palladium C(sp3)-centered radical intermediate and broad reaction scope, highlighting the diverse applicability and the potential utility of this protocol in late-stage functionalization.
Matrix-IR Spectroscopic Investigations of the Thermolysis and Photolysis of Diazoamides
作者:Curt Wentrup、Hervé Bibas、Arvid Kuhn、Ullrich Mitschke、Mark C. McMills
DOI:10.1021/jo401695x
日期:2013.11.1
Matrix photolysis of N,N-dialkyldiazoacetamides 1a–d at 7–10 K results in either the formation of C–H insertion products (in case of N,N-dimethyl and N,N-diethyl diazoamides) or almost exclusive Wolff rearrangement to ketenes (in the case of the cyclic diazoamides N-(diazoacetyl)azetidine and N-(diazoacetyl)pyrrolidine). This can be ascribed to higher activation barriers for the approach of the singlet
copper(I)-catalyzed vinylation of diazo compounds with vinylbenziodoxolone reagents (VBX) as partners is reported. The transformation tolerates diversefunctionalities on both reagents delivering polyfunctionalized vinylated products. The strategy was successfully extended to a three-component/intermolecular version with alcohols. The obtained products contain synthetically versatile functional groups, such
Copper-Catalyzed Oxy-Alkynylation of Diazo Compounds with Hypervalent Iodine Reagents
作者:Durga Prasad Hari、Jerome Waser
DOI:10.1021/jacs.6b00278
日期:2016.2.24
Alkynes have found widespread applications in synthetic chemistry, biology, and materials sciences. In recent years, methods based on electrophilic alkynylation with hypervalent iodine reagents have made acetylene synthesis more flexible and efficient, but they lead to the formation of one equivalent of an iodoarene as side-product. Herein, a more efficient strategy involving a copper-catalyzed oxy-alkynylation