Alkyl and alkoxycarbonyl radicals were generated by oxidative decarboxylation of oxalic acid monoesters by persulfate; they were then utilized for the selective substitution of quinones.
草酸单酯被过硫酸盐氧化脱羧生成烷基和烷氧羰基;然后将它们用于醌的选择性取代。
Metal-, Photocatalyst-, and Light-Free, Late-Stage C–H Alkylation of Heteroarenes and 1,4-Quinones Using Carboxylic Acids
作者:Daniel R. Sutherland、Marcos Veguillas、Conor L. Oates、Ai-Lan Lee
DOI:10.1021/acs.orglett.8b02988
日期:2018.11.2
Contrary to the accepted convention, this work shows that Minisci-type C–Halkylation does not require any metal, photocatalyst, light, or prefunctionalization of the readily available and inexpensive carboxylic acids to proceed well under mild conditions. These mild conditions can be utilized for late-stage alkylations of complex molecules, including pharmaceutical compounds and light-sensitive compounds
Iron-Catalyzed Radical Methylation of Activated Alkenes with tert-Butanol as the Methyl Source
作者:Zhengbao Xu、Rui Jia、Zhiwei Ma、Shouhao Cao、Liang Shen、Hongfang Ji
DOI:10.1055/s-0039-1690193
日期:2019.10
A free-radical-initiated methylation/addition/cyclization of N-arylacrylamides and a methylation/addition/elimination of quinines have been developed in which t-BuOH is used as a methylsource. These reactions provide effective and selective methods for the synthesis of various methylated oxindoles and quinones in moderate to good yields.
Asymmetric weitz - scheffer epoxidation promoted by bovine serum albumin
作者:Stefano Colona、Nicoletta Gaggero、Amedea Manfredil、Massimo Spadoni、Luigi Casella、Giacomo Carrea、Piero Pasta
DOI:10.1016/s0040-4020(01)86023-3
日期:1988.1
The epoxidation of 2-substituted naphthoquinones with t-BuOOH in an aqueous buffer solution containing a small amount (up to 5 % molar equiv) of bovine serum albumin (BSA) gives the corresponding epoxides with enantiomeric excess (e.e.) up to 100 %. The enantioselectivity is very sensitive to the addition of water miscible or immiscible cosolvents and to the length of the alkyl chain in position 2
Quinone C–H Alkylations via Oxidative Radical Processes
作者:Ryan Baxter、Akil Hamsath、Jordan Galloway
DOI:10.1055/s-0037-1610005
日期:2018.8
context of selecting optimum radical precursors and initiators depending on quinone identity and functional groups present. A brief survey of radical additions to quinones is reported. Carboxylic acids, aldehydes, and unprotected amino acids are compared as alkyl radical precursors for the mono- or bis- C–H alkylation of several quinones. Two methods for radical initiation are discussed comparing inorganic