1605282-71-0

Upstream product

• 22627-70-9 3-ethoxycyclopent-2-en-1-one 
• 112981-69-8 3,5-bis(trifluoromethyl)phenylmagnesium bromide 
• 18766-96-6 3-oxocyclopent-1-en-1-yl acetate 
• 73852-19-4 3,5-bis-trifluromethylphenylboronic acid 

Downstream Products

• 1605282-63-0 C₂₈H₁₉F₆NO₃S 

Relevant academic research and scientific papers

C-O Bond Activation as a Strategy in Palladium-Catalyzed Cross-Coupling

The activation of strong C-O bonds in cross-coupling catalysis can open up new oxygenate-based feedstocks and building blocks for complex-molecule synthesis. Although Ni catalysis has been the major focus for cross-coupling of carboxylate-based electrophiles, we recently demonstrated that palladium catalyzes not only difficult C-O oxidative additions but also Suzuki-Type cross-couplings of alkenyl carboxylates under mild conditions. We propose that, depending on the reaction conditions, either a typical Pd(0)/(II) mechanism or a redox-neutral Pd(II)-only mechanism can operate. In the latter pathway, C-C bond formation occurs through carbopalladation of the alkene, and C-O cleavage by β-carboxyl elimination. 1 Introduction 2 A Mechanistic Challenge: Activating Strong C-O Bonds 3 Exploiting Vinylogy for C-Cl and C-O Oxidative Additions 4 An Alternative Mechanism for Efficient Cross-Coupling Catalysis 5 Conclusions and Outlook.

Palladium-Catalyzed Cross-Coupling of Alkenyl Carboxylates

Carboxylate esters have many desirable features as electrophiles for catalytic cross-coupling: they are easy to access, robust during multistep synthesis, and mass-efficient in coupling reactions. Alkenyl carboxylates, a class of readily prepared non-aromatic electrophiles, remain difficult to functionalize through cross-coupling. We demonstrate that Pd catalysis is effective for coupling electron-deficient alkenyl carboxylates with arylboronic acids in the absence of base or oxidants. Furthermore, these reactions can proceed by two distinct mechanisms for C?O bond activation. A Pd0/II catalytic cycle is viable when using a Pd0 precatalyst, with turnover-limiting C?O oxidative addition; however, an alternative pathway that involves alkene carbopalladation and β-carboxyl elimination is proposed for PdII precatalysts. This work provides a clear path toward engaging myriad oxygen-based electrophiles in Pd-catalyzed cross-coupling.

Asymmetric [5+3] formal cycloadditions with cyclic enones through cascade dienamine-dienamine catalysis

A few aminocatalytic modes, such as iminium ions and different dienamines, have provided versatile tools for the functionalization of cyclic enones at various sites. Described here is a previously unreported cascade dienamine/dienamine catalytic pathway for β-substituted 2-cyclopentenones, and even 2-cyclohexenone. It involves domino α′-regioselective Michael addition and a γ-regioselective Mannich reaction with 3-vinyl-1,2-benzoisothiazole-1,1-dioxides to give fused or bridged architectures, which incorporate a spirocyclic skeleton, in excellent stereocontrol, thus furnishing unusual [5+3] formal cycloaddition reactions. Moreover, preliminary biological assays showed that some of the chiral products exhibited promising activity against some cancer cell lines, thus indicating that such skeletons might serve as leads in drug discovery.