Rh(II)‐Catalyzed Denitrogenative Reaction of 1,2,3‐Triazolyl Esters with Indoles or Arenes: Efficient Synthesis of Homotryptamines or Allylamines
作者:Kuntal Pal、Geetanjali S. Sontakke、Chandra M. R. Volla
DOI:10.1002/adsc.202000632
日期:2020.9.8
efficient strategy for the synthesis of structurally diverse homotryptamines and allyl amines via a Rh(II)‐catalyzed tandem reaction of 1,2,3‐triazolyl esters with either indoles or 1,3,5‐trimethoxybenzene has been developed. The reaction proceeds via Rh(II)‐catalyzed intramolecular rearrangement of triazoles into 1‐azadienes followed by regioselective nucleophilic addition. The efficiency of the current
Gold Catalysis: Phenol Synthesis in the Presence of Functional Groups
作者:A. Stephen K. Hashmi、Jan P. Weyrauch、Elzen Kurpejović、Tanja M. Frost、Burkhard Miehlich、Wolfgang Frey、Jan W. Bats
DOI:10.1002/chem.200501268
日期:2006.7.24
acylated hydroxymethyl and ammonium groups, on the furan ring of substrates in gold-catalyzed phenolsynthesis has been investigated. The furan ring was also replaced by different heterocycles, such as pyrroles, thiophenes, oxazoles, and a 2,4-dimethoxyphenyl group; goldcatalysis then delivered no phenols, but occasionally other products were obtained. [Ru(3)(CO)(12)] also catalyzed the conversion
Combining Oxidative N-Heterocyclic Carbene Catalysis with Click Chemistry: A Facile One-Pot Approach to 1,2,3-Triazole Derivatives
作者:B. T. Ramanjaneyulu、Virsinha Reddy、Panjab Arde、Sriram Mahesh、R. Vijaya Anand
DOI:10.1002/asia.201300138
日期:2013.7
A combination of the oxidative N‐heterocyclic carbene catalysis and click chemistry has been explored for the direct, one‐potsynthesis of 1,2,3‐triazole derivatives from aromaticaldehydes. This procedure was found to be very efficient and a variety of 1,2,3‐triazole derivatives could be accessed through their corresponding propargyl esters in moderate‐to‐good yields under mild conditions.
The Goldilocks Principle in Phase Labeling. Minimalist and Orthogonal Phase Tagging for Chromatography-Free Mitsunobu Reaction
作者:Mariann Szigeti、Zoltán Dobi、Tibor Soós
DOI:10.1021/acs.joc.8b00014
日期:2018.3.2
An inexpensive and chromatography-free Mitsunobu methodology has been developed using low molecular weight and orthogonally phase-tagged reagents, a tert-butyl-tagged highly apolar phosphine, and a water-soluble DIAD analogue. The byproduct of the Mitsunobureactions can be removed by sequential liquid–liquidextractions using traditional solvents such as hexanes, MeOH, water, and EtOAc. Owing to the
Tri(t-butyl)phosphine and terminal alkynes undergo 1,2-phosphorus-migrative [3 + 2] cycloaddition in the presence of a proton source under photocatalytic conditions. The reaction exhibits broad functional group tolerance and affords substituted cyclic phosphonium salts, which are amenable to further derivatization by Wittig olefination. Theoretical studies suggest that the phosphorus 1,2-migration