243661-79-2Relevant academic research and scientific papers
Transition-Metal-Free C-C, C-O, and C-N Cross-Couplings Enabled by Light
Liu, Wenbo,Li, Jianbin,Querard, Pierre,Li, Chao-Jun
supporting information, p. 6755 - 6764 (2019/05/06)
Transition-metal-catalyzed cross-couplings to construct C-C, C-O, and C-N bonds have revolutionized chemical science. Despite great achievements, these metal catalysts also raise certain issues including their high cost, requirement of specialized ligands, sensitivity to air and moisture, and so-called "transition-metal-residue issue". Complementary strategy, which does not rely on the well-established oxidative addition, transmetalation, and reductive elimination mechanistic paradigm, would potentially eliminate all of these metal-related issues. Herein, we show that aryl triflates can be coupled with potassium aryl trifluoroborates, aliphatic alcohols, and nitriles without the assistance of metal catalysts empowered by photoenergy. Control experiments reveal that among all common aryl electrophiles only aryl triflates are competent in these couplings whereas aryl iodides and bromides cannot serve as the coupling partners. DFT calculation reveals that once converted to the aryl radical cation, aryl triflate would be more favorable to ipso substitution. Fluorescence spectroscopy and cyclic voltammetry investigations suggest that the interaction between excited acetone and aryl triflate is essential to these couplings. The results in this report are anticipated to provide new opportunities to perform cross-couplings.
Nickel catalyzed decarboxylative alkylation of aryl triflates with anhydrides
Chen, Hui,Liao, Xuebin
supporting information, p. 4186 - 4191 (2019/06/18)
Aliphatic acid anhydrides are the versatile building blocks and the new method for the conversion of anhydrides is thus of great significance. Herein, we report the decarboxylative alkylation of aryl triflates with aliphatic acid anhydrides via nickel catalysis. This novel method provides a facile access to construct Csp2-Csp3 bond. In addition, this method is compatible with a broad array of functional groups and exhibits good substrates scope.
A complementary method to obtain N-acyl enamides using the Heck reaction: Extending the substrate scope for asymmetric hydrogenation
Harrison, Paul,Meek, Graham
, p. 9277 - 9280 (2007/10/03)
A series of N-acyl enamides were prepared using the Heck reaction. Asymmetric hydrogenation provided protected amines in up to 99% ee. A method to prepare N-acyl enamides is reported that is complementary to the existing protocols. Heck reaction of a vari
Selective functionalization of 1,2-dihydronaphthalenols leads to a concise, stereoselective synthesis of sertraline
Lautens, Mark,Rovis, Tomislav
, p. 8967 - 8976 (2007/10/03)
Asymmetric reductive ring opening of oxabenzonorbornadiene provides dihydronaphthalenols in high ee and good yield. Functionality present in this system can be used to elaborate the core towards a number of targets. As an illustration, a concise stereoselective synthesis of the important antidepressant sertraline is described.
