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
Protic Acid Immobilized on Solid Support as an Extremely Efficient Recyclable Catalyst System for a Direct and Atom Economical Esterification of Carboxylic Acids with Alcohols
作者:Asit K. Chakraborti、Bavneet Singh、Sunay V. Chankeshwara、Alpesh R. Patel
DOI:10.1021/jo900614s
日期:2009.8.21
reported by direct condensation of equimolar amounts of carboxylic acids with alcohols catalyzed by an easy to prepare catalyst system of perchloricacid immobilized on silicagel (HClO4−SiO2). The direct condensation of aryl, heteroaryl, styryl, aryl alkyl, alkyl, cycloalkyl, and long-chain aliphatic carboxylic acids with primary/secondary alkyl/cycloalkyl, allyl, propargyl, and long-chain aliphatic alcohols
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.
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