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
Versatile cross-dehydrogenative coupling of heteroaromatics and hydrogen donors via decatungstate photocatalysis
作者:Matteo C. Quattrini、Saki Fujii、Keiichi Yamada、Takahide Fukuyama、Davide Ravelli、Maurizio Fagnoni、Ilhyong Ryu
DOI:10.1039/c6cc09725a
日期:——
A facile sunlight-induced derivatization of heteroaromaticsviaTBADT photocatalyzed C–H functionalization in amides, ethers, alkanes and aldehydes is described.
Efficient Cross-Coupling of Secondary Alkyltrifluoroborates with Aryl Chlorides—Reaction Discovery Using Parallel Microscale Experimentation
作者:Spencer D. Dreher、Peter G. Dormer、Deidre L. Sandrock、Gary A. Molander
DOI:10.1021/ja8031423
日期:2008.7.1
Microscale parallel experimentation was used to discover three catalyst systems capable of coupling secondary organotrifluoroborates with sterically and electronically demanding aryl chlorides and bromides. The ensuing results represent the first comprehensive study of alkylboron coupling to aryl chlorides and, in particular, using secondary alkylboron partners. A ligand-dependent beta-hydride elimination/reinsertion mechanism was implicated in the cross-coupling of more hindered substrates, leading to isomeric mixtures of coupled products in some cases.