Zn(OTf)<sub>2</sub>-Catalyzed Cyclization of Proparyl Alcohols with Anilines, Phenols, and Amides for Synthesis of Indoles, Benzofurans, and Oxazoles through Different Annulation Mechanisms
作者:Manyam Praveen Kumar、Rai-Shung Liu
DOI:10.1021/jo0606711
日期:2006.6.1
intermediates A and C were isolated as reaction intermediates. The 1,2-nitrogen shift in the formation of indole is catalyzed by Zn(OTf)2, and its mechanism has been elucidated. This catalytic cyclization is also applicable to the synthesis of oxazoles through the cyclization of propargyl alcohols and amides without a 1,2-nitrogen shift.
We developed an environmentally friendly mechanochemical protocol to induce an effective Fischer indolisation to synthesize indoles and indolines taking advantage of oxalic acid and dimethylurea.
Biocatalytic Stereoselective Oxidation of 2-Arylindoles
作者:Sarah E. Champagne、Chang-Hwa Chiang、Philipp M. Gemmel、Charles L. Brooks、Alison R. H. Narayan
DOI:10.1021/jacs.3c12393
日期:2024.1.31
3-hydroxyindolenines is complicated by overoxidation, rearrangements, and complex product mixtures. The selectivity possible in enzymatic reactions can overcome these challenges and deliver enantioenriched products. Herein, we present the development of an asymmetric biocatalyticoxidation of 2-arylindole substrates aided by a curated library of flavin-dependent monooxygenases (FDMOs) sampled from an ancestral sequence
An Annulative Approach to Highly Substituted Indoles: Unusual Effect of Phenolic Additives on the Success of the Arylation of Ketone Enolates
作者:Jennifer L. Rutherford、Matthew P. Rainka、Stephen L. Buchwald
DOI:10.1021/ja0288993
日期:2002.12.1
novel palladium-catalyzed arylation of ketone enolates with o-nitrohaloarenes was achieved through the addition of phenol additives. The mild reaction conditions employed allowed for the inclusion of a wide variety of functional groups in both substrates to be tolerated. The products of this reaction were then readily reductively cyclized to give highly substituted indoles in moderate to excellent overall