Atroposelective Arene Formation by Carbene‐Catalyzed Formal [4+2] Cycloaddition
作者:Ke Xu、Wenchang Li、Shaoheng Zhu、Tingshun Zhu
DOI:10.1002/anie.201910049
日期:2019.12.2
Atroposelective arene formation is an efficient method to build axially chiral molecules with multi-substituted arenes. Reported here is an organocatalyzed atroposelective arene formationreaction by an N-heterocyclic carbene (NHC) catalyzed formal [4+2] cycloaddition of conjugated dienals and α-aryl ketones. This study expands the synthetic potential of NHC organocatalysis and provides a competitive
C–C Activation by Retro-Aldol Reaction of Two β-Hydroxy Carbonyl Compounds: Synergy with Pd-Catalyzed Cross-Coupling To Access Mono-α-arylated Ketones and Esters
作者:Song-Lin Zhang、Ze-Long Yu
DOI:10.1021/acs.joc.5b02098
日期:2016.1.4
retro-aldol reaction of two β-hydroxy compounds in synergy with Pd-catalyzedcross-coupling of aryl halides is reported herein, which produces selectively mono-α-arylated ketones and esters in good yields. This reaction is compatible with a broad range of aryl iodides, bromides, chlorides, and triflates and can tolerate an array of functional groups on the aromatic ring. Ready scale-up of this reaction to gram
A Practical Synthesis of α-Aryl Methyl Ketones via a Transition-Metal-Free Meerwein Arylation
作者:Carmela Molinaro、Jeffrey Mowat、Francis Gosselin、Paul D. O'Shea、Jean-François Marcoux、Rémy Angelaud、Ian W. Davies
DOI:10.1021/jo062483g
日期:2007.3.1
We report herein a simple, scalable, transition-metal-free approach to the synthesis of α-aryl methyl ketones from diazonium tetrafluoroborate salts under mild conditions. This methodology uses easily accessible and nontoxic startingmaterial and was applied to the multi-kilogram-scale preparation of 1-(3-bromo-4-methylphenyl)propan-2-one.
Divergent synthesis of indoles, oxindoles, isocoumarins and isoquinolinones by general Pd-catalyzed retro-aldol/α-arylation
作者:Song-Lin Zhang、Ze-Long Yu
DOI:10.1039/c6ob01979j
日期:——
Divergent synthesis of indoles, oxindoles, isocoumarins and isoquinolinones is described in this report by using a general Pd-catalyzed tandem reaction of β-hydroxy carbonyl compounds with aryl halides bearing an ortho-nitro, -ester or -cyano substituent. A key retro-aldol/α-arylation reaction is involved that merges classic Pd cross-coupling chemistry with novel Pd-promoted retro-aldol C–C activation