Ethynylbenziodazolones (EBZ) as Electrophilic Alkynylation Reagents for the Highly Enantioselective Copper‐Catalyzed Oxyalkynylation of Diazo Compounds
radicals and nucleophiles, yet they present limited possibilities for further structure and reactivity modification. Herein, the first synthesis is reported for the corresponding ethynylbenziodazolone (EBZ) reagents, in which the oxygen atom in the iodoheterocycle is replaced by a nitrogen atom. The substituent on the nitrogen enables further fine‐tuning of the reagent structure and reactivity. EBZ reagents
Mechanochemical Rhodium(III)‐ and Gold(I)‐Catalyzed C−H Bond Alkynylations of Indoles under Solventless Conditions in Mixer Mills
作者:Gary N. Hermann、Marvin T. Unruh、Se‐Hyeong Jung、Maik Krings、Carsten Bolm
DOI:10.1002/anie.201805778
日期:2018.8.13
processes show excellent functional group tolerance, do not require additional heating and proceed undersolventlessconditions. Compared to solvent‐based standard protocols, the reaction times are shorter and the catalyst quantities lower resulting in high product yields under ambient atmosphere in mixer mills.
Catalytic Friedel–Crafts Reaction of Aminocyclopropanes
作者:Florian de Nanteuil、Joachim Loup、Jérôme Waser
DOI:10.1021/ol401616a
日期:2013.7.19
A Lewis acid catalyzed Friedel-Crafts reaction between donor-acceptor aminocyclopropanes and indoles and other electron-rich aromatic compounds is reported. Indole alkylation at the C3 position was generally obtained for a broad range of functional groups and substitution patterns. In the case of C3-substituted indoles, C2 alkylation was observed. The reaction gives a rapid access to gamma amino acid derivatives present in numerous bioactive molecules.
Synthesis of 1-[(Triisopropylsilyl)ethynyl]-1λ3,2-benziodoxol-3(1H)-one and Alkynylation of Indoles, Thiophenes, and Anilines
作者:Jérôme Waser、Jonathan Brand
DOI:10.1055/s-0031-1290589
日期:2012.4
An efficient procedure was developed for the synthesis of 1-[(triisopropylsilyl)ethynyl]-1 lambda(3),2-benziodoxol-3(1H)-one on a 100-mmol (36-g) scale. The benziodoxolone can be used for the gold-catalyzed direct alkynylation of indole, 2-hexylthiophene, or N,N-dibenzylaniline on a 5- to 10-mmol scale.
Rapid synthesis of indole cis-enamides via hydroamidation of indolic alkynes
作者:Emma Dickson、Brent R. Copp、David Barker
DOI:10.1016/j.tetlet.2013.07.081
日期:2013.9
The synthesis of indolic cis-enamides using a ruthenium-mediated hydroamidation of indole alkynes with primary oxalamides or alpha-keto amides is reported. Using this method the total synthesis of igzamide and Z-coscinamides A and B has been achieved. (C) 2013 Elsevier Ltd. All rights reserved.