Bismuth(<scp>iii</scp>)-catalyzed regioselective alkylation of tetrahydroquinolines and indolines towards the synthesis of bioactive core-biaryl oxindoles and CYP19 inhibitors
作者:Namrata Prusty、Lakshmana K. Kinthada、Rohit Meena、Rajesh Chebolu、Ponneri Chandrababu Ravikumar
DOI:10.1039/d0ob02385j
日期:——
Bismuth(III)-catalyzed regioselective functionalization at the C-6 position of tetrahydroquinolines and the C-5 position of indolines has been demonstrated. For the first time, one pot symmetrical and unsymmetrical arylation of isatins with tetrahydroquinolines was accomplished giving a completely new product skeleton in good to excellent yields. Most importantly, this protocol leads to the formation
Ester Formation via Symbiotic Activation Utilizing Trichloroacetimidate Electrophiles
作者:Nivedita S. Mahajani、Rowan I. L. Meador、Tomas J. Smith、Sarah E. Canarelli、Arijit A. Adhikari、Jigisha P. Shah、Christopher M. Russo、Daniel R. Wallach、Kyle T. Howard、Alexandra M. Millimaci、John D. Chisholm
DOI:10.1021/acs.joc.9b00745
日期:2019.6.21
Trichloroacetimidates are useful reagents for the synthesis of esters under mild conditions that do not require an exogenous promoter. These conditions avoid the undesired decomposition of substrates with sensitive functional groups that are often observed with the use of strong Lewis or Brønsted acids. With heating, these reactions have been extended to benzyl esters without electron-donating groups. These inexpensive
Hydrogen bonding is ubiquitous throughout nature and serves as a versatile platform for accessing chemicalreactivity. In leveraging this force, chemists have utilized organocatalysts to expand the spectrum of chemicalreactivity enabled by hydrogen bonding and at the extreme proton transfer. Despite this broad utility, exploiting charge as a hydrogen-bond activation strategy is unknown for squaramide
Alkylation of Sulfonamides with Trichloroacetimidates under Thermal Conditions
作者:Daniel R. Wallach、John D. Chisholm
DOI:10.1021/acs.joc.6b01421
日期:2016.9.2
with trichloroacetimidates is reported. This transformation does not require an exogenous acid, base, or transition metal catalyst; instead the addition occurs in refluxing toluene without additives. The sulfonamide alkylation partner appears to be only limited by sterics, with unsubstituted sulfonamides providing better yields than more encumbered N-alkyl sulfonamides. The trichloroacetimidate alkylating
Nucleophilic Substitution Catalyzed by a Supramolecular Cavity Proceeds with Retention of Absolute Stereochemistry
作者:Chen Zhao、F. Dean Toste、Kenneth N. Raymond、Robert G. Bergman
DOI:10.1021/ja508799p
日期:2014.10.15
of reactions whose stereochemicalcourse is completely reversed are exceedingly rare. We report herein a class of water-soluble host assemblies that is capable of catalyzing the substitution reaction at a secondary benzylic carbon center to give products with overall stereochemical retention, while reaction of the same substrates in bulk solution gives products with stereochemical inversion. Such ability