896101-81-8Relevant articles and documents
Tris(pentafluorophenyl)borane-Catalyzed Formal Cyanoalkylation of Indoles with Cyanohydrins
Kiyokawa, Kensuke,Minakata, Satoshi,Urashima, Naruyo
, p. 8389 - 8401 (2021/06/28)
Despite the significant achievements related to the C3 functionalization of indoles, cyanoalkylation reactions continue to remain rather limited. We herein report on the formal C3 cyanoalkylation of indoles with cyanohydrins in the presence of a tris(pentafluorophenyl)borane (B(C6F5)3) catalyst. It is noteworthy that cyanohydrins are used as a cyanoalkylating reagent in the present reaction, even though they are usually used as only a HCN source. Mechanistic investigations revealed the unique reactivity of the B(C6F5)3 catalyst in promoting the decomposition of a cyanohydrin by a Lewis acidic activation through the coordination of the cyano group to the boron center. In addition, a catalytic three-component reaction using indoles, aldehydes as a carbon unit, and acetone cyanohydrin that avoids the discrete preparation of each aldehyde-derived cyanohydrin is also reported. The developed methods provide straightforward, highly efficient, and atom-economic access to various types of synthetically useful indole-3-acetonitrile derivatives containing α-tertiary or quaternary carbon centers.
The discovery of carboline analogs as potent MAPKAP-K2 inhibitors
Wu, Jiang-Ping,Wang, Ji,Abeywardane, Asitha,Andersen, Denise,Emmanuel, Michel,Gautschi, Elda,Goldberg, Daniel R.,Kashem, Mohammed A.,Lukas, Susan,Mao, Wang,Martin, Leslie,Morwick, Tina,Moss, Neil,Pargellis, Christopher,Patel, Usha R.,Patnaude, Lori,Peet, Gregory W.,Skow, Donna,Snow, Roger J.,Ward, Yancey,Werneburg, Brian,White, Andre
, p. 4664 - 4669 (2008/02/13)
The discovery of a series of potent, carboline-based MK2 inhibitors is described. These compounds inhibit MK2 with IC50s as low as 10 nM, as measured in a DELFIA assay. An X-ray crystal structure reveals that they bind in a region near the p-lo
Mapping the melatonin receptor. 7. Subtype selective ligands based on β-substituted N-acyl-5-methoxytryptamines and β-Substituted N-acyl-5-methoxy-1-methyltryptamines
Tsotinis, Andrew,Vlachou, Margarita,Papahatjis, Demetris P.,Calogeropoulou, Theodora,Nikas, Spyros P.,Garratt, Peter J.,Piccio, Vincent,Vonhoff, Stefan,Davidson, Kathryn,Teh, Muy-Teck,Sugden, David
, p. 3509 - 3519 (2007/10/03)
A series of β-substituted and β,β-disubstituted N-acyl 5-methoxy-1-methyltryptamines and 5-methoxytryptamines have been prepared as melatonin analogues to investigate the nature of the binding site of the melatonin receptor. The affinity of analogues was determined in a radioligand binding assay using cloned human MT1 and MT2 receptor subtypes expressed in NIH 3T3 cells. Agonist and antagonist potency of all analogues was measured using the pigment aggregation response of a clonal line of Xenopus laevis melanophores, β-Methylmelatonin (17a) and β,β-dimethylmelatonin (17b), though showing a slight decrease in binding at human receptors, show an increase in potency on Xenopus, N-Butanoyl 5-methoxy-1-methyl-β,β-trimethylenetryptamine (12c) is an antagonist at human MT1 receptors but an agonist at MT2, while N-butanoyl 5-methoxy-1-methyl-β,β-tetramethylenetryptamine (13c) is an antagonist at MT1 but had no action at MT2 and is one of the first examples of an MT1 selective antagonist.
