A general and expeditious approach for the copper mediated synthesis of multi‐functionalized dihydropyrazoles from N‐sulfonylhydrazones and sulfoxonium ylides has been achieved under aerobic oxidative conditions. The formal [4+1] cycloaddition reaction exhibits many notable features and can be easily scaled up to gram scale.
Palladium-Catalyzed Coupling of Sulfonylhydrazones with Heteroaromatic 2-Amino-Halides (Barluenga Reaction): Exploring the Electronics of the Sulfonylhydrazone
作者:Hongyu Tan、Ioannis Houpis、Renmao Liu、Youchu Wang、Zhilong Chen、Matthew J. Fleming
DOI:10.1021/acs.oprd.5b00211
日期:2015.8.21
paper describes a new reactivity of the Pd-catalyzed coupling of 2-amino-3-bromo-aromatic and heteroaromatic compounds with sulfonylhydrazones (Barluenga reaction).The new catalyst system and modulation of the electronic nature of hydrazone that were needed for successful reaction are described herein.
Halogen-Bond-Promoted α-C−H Amination of Ethers for the Synthesis of Hemiaminal Ethers
作者:Zhangjin Pan、Zhenwei Fan、Beili Lu、Jiajia Cheng
DOI:10.1002/adsc.201800006
日期:2018.5.2
A simple halogen‐bond‐promoted α‐C−H amination of ether/thioether with a variety of N−H compounds has been accomplished. In the presence of low‐cost and readily available perfluorobutyl iodide, a diverse range of hemiaminal ether derivatives, including the valuable hydrazone hemiaminal ethers, were quickly assembled under thermal or visible‐light irradiation conditions. Mechanistic studies suggest
olefins by coupling of electron deficient sulfonylhydrazones with aryl sulfinate salts in the presence of a palladium(II) catalyst under aerobic conditions. This methodology obviates the need for preparation of an organometallic and separate activation of the ketone starting material via a vinyl halide or triflate. The oxidant, reagent stoichiometry, and the electronics of the sulfinate coupling partner
Photoactivation of Hydrazones for the Synthesis of Diarylalkanes and Trialkylmethylboronates: The Key Role Played by Soluble Base
作者:Po-Kai Peng、Clayton P. Donald、Zhencheng Dong、Jeremy A. May
DOI:10.1021/acs.orglett.4c00873
日期:2024.4.26
The synthesis of diaryl alkanes and tertiary organoboronates via Barluenga coupling at roomtemperature occurred via photoactivated conversion of aryl sulfonyl hydrazones to diazo compounds in the presence of soluble bases. The combination of arylsulfonyl hydrazone and a soluble base is necessary to provide a near-UV chromophore. Using aromatic hydrazones and aromaticboronicacids resulted in rapid