Keteniminium‐Driven Umpolung Difunctionalization of Ynamides
作者:Shubham Dutta、Shengwen Yang、Rajeshwer Vanjari、Rajendra K. Mallick、Vincent Gandon、Akhila K. Sahoo
DOI:10.1002/anie.201915522
日期:2020.6.26
synthesis of novel triaryl‐substituted enamides is described. This transformation represents the first example of an umpolung regioselective unsymmetrical syn ‐1,2‐diarylation/aryl‐olefination of ynamides. The aryl moieties of the diazonium salt (electrophile) and boronic acid (nucleophile) are explicitly incorporated in the electrophilic α‐ and nucleophilic β‐position, respectively, of the ynamide
Ring Expansion and 1,2‐Migration Cascade of Benzisoxazoles with Ynamides: Experimental and Theoretical Studies
作者:Rajeshwer Vanjari、Shubham Dutta、B. Prabagar、Vincent Gandon、Akhila K. Sahoo
DOI:10.1002/asia.201901251
日期:2019.12.13
α-imino vinylic gold intermediate, and 1,2-migration of the sulfonamide motif to the masked carbene center to deliver the respective ring-expanded benzo[e][1,3]oxazine of predominant E configuration. A trapping experiment justifies the participation of the α-imino masked gold carbene. DFT computations also support the hypothesized mechanism and rationalize the product stereoselectivity.
[Object]
A novel and excellent method for preventing or treating rejection in the transplantation of various organs, allergy diseases, autoimmune diseases, hematologic tumor, or the like, based on a PI3Kδ-selective inhibitory action and/or an IL-2 production inhibitory action, and/or a B cell proliferation inhibitory action (including an activation inhibitory action), is provided
[Means for Solution]
It was found that a 3-substituted triazine or 3-substituted pyrimidine derivative exhibits a PI3Kδ-selective inhibitory action, and/or an IL-2 production inhibitory action, and/or a B cell proliferation inhibitory action (including an activation inhibitory action), and can be an agent for preventing or treating rejection in the transplantation of various organs, allergy diseases (asthma, atopic dermatitis, etc.), autoimmune diseases (rheumatoid arthritis, psoriasis, ulcerative colitis, Crohn's disease, systemic lupus erythematosus, etc.), hematologic tumor (leukemia etc.), or the like, thereby completing the present invention.