Vinyl Triflate–Aldehyde Reductive Coupling–Redox Isomerization Mediated by Formate: Rhodium‐Catalyzed Ketone Synthesis in the Absence of Stoichiometric Metals
作者:William G. Shuler、Robert A. Swyka、Tabitha T. Schempp、Brian J. Spinello、Michael J. Krische
DOI:10.1002/chem.201903668
日期:2019.9.25
Direct conversion of aldehydes to ketones is achieved via rhodium-catalyzed vinyl triflate-aldehyde reductive coupling-redox isomerization mediated by potassium formate. This method circumvents premetalated C-nucleophiles and discrete redox manipulations typically required to form ketonesfrom aldehydes.
A Mn(<scp>iii</scp>)/TEMPO-co-mediated tandem azidation–1,2-carbon migration reaction of allylic silyl ethers
作者:Zhi-Min Chen、Zhen Zhang、Yong-Qiang Tu、Ming-Hui Xu、Fu-Min Zhang、Chen-Chen Li、Shao-Hua Wang
DOI:10.1039/c4cc04707a
日期:——
A novel Mn(III)/TEMPO-co-mediated tandem azidation-1,2-carbon migration reaction of allylic silylethers with an unactivated C=C bond has been explored, generating alpha-aryl-alkyl beta-azido ketones with an alpha-quaternary stereocenter.
Electrochemical halogenation/semi-pinacol rearrangement of allylic alcohols using inorganic halide salt: an eco-friendly route to the synthesis of β-halocarbonyls
An efficient and eco-friendly electrochemical method involving halogenation/semi-pinacol rearrangement of allylic alcohols using inorganic halide salt as the halogen source to synthesize various β-halocarbonyls bearing an all-carbon α-quaternary center undermild reaction conditions has been developed (X = Br, Cl). Stoichiometric oxidants, metal catalysts, and even external electrolytes were avoided
Halogen Cation Induced StereoselectiveSemipinacol-type Rearrangement of Allylic Alcohols: A Highly EfficientApproach to α-Quaternary β-Haloketo Compounds
作者:Yong Qiang Tu、Bao Min Wang、Zhen Lei Song、Chun An Fan、Wei Ming Chen
DOI:10.1055/s-2003-40855
日期:——
Allylic alcohols were found to undergo a semipinacol-type rearrangement induced by halogen cation generated from the chloramine-T/ZnX 2 combination, which provided a highly efficient and stereoselective method for the preparation of α-quatemary β-haloketo compounds. This reaction is valuable and versatile since a quaternary carbon could be constructed effectively and three kinds of β-haloketo compounds
Arylation and Vinylation of Alkenes Based on Unusual Sequential Semipinacol Rearrangement/Grob Fragmentation of Allylic Alcohols
作者:Dao-Yi Yuan、Yong-Qiang Tu、Chun-An Fan
DOI:10.1021/jo801434b
日期:2008.10.3
Alkenes can be stereoselectively arylated and vinylated without transition-metal catalyst under mild conditions through an interesting NBS-promoted semipinacol rearrangement and a subsequent unusual NaOH-mediated Grob fragmentation.