Allosteric Functional Switch of Neurokinin A-Mediated Signaling at the Neurokinin NK2 Receptor: Structural Exploration
摘要:
The neurokinin NK2 receptor is known to pre-exist in equilibrium between at least three states: resting-inactive, calcium-triggering, and cAMP-producing. Its endogeneous ligand, NKA, mainly induces the calcium response. Using a FRET-based assay, we have previously discovered an allosteric modulator of the NK2 receptor that has the unique ability to discriminate among the two signaling pathways: calcium-signaling is not affected while CAMP signaling is significantly decreased. A series of compounds have been prepared and studied in order to better understand the structural determinants of this allosteric functional switch of a GPCR. Most of them display the same allosteric profile, with smooth pharmacomodulation. One compound however exhibits significantly improved modulatory properties of NKA induced signaling when compared to the original modulator.
Thermal Rearrangement of Sulfamoyl Azides: Reactivity and Mechanistic Study
作者:Xiaodong Zou、Jiaqi Zou、Lizheng Yang、Guigen Li、Hongjian Lu
DOI:10.1021/acs.joc.7b00308
日期:2017.5.5
The rearrangement of sulfamoyl azides under thermal conditions to form a C–C bond while breaking two C–N bonds is reported. Mechanisticstudy shows that this reaction goes through a Curtius-type rearrangement to form a 1,1-diazene, then which rearranges possibly through both a concerted rearrangement process and a stepwise radical process. This rearrangement could be used in the synthesis of complex
Reductive Amination of Aldehydes Using Aminoboranes as Iminium Ion Generators
作者:Michinori Suginome、Yusuke Tanaka、Tomoaki Hasui
DOI:10.1055/s-2006-939070
日期:——
2-Dialkylamino-4H-1,3,2-benzodioxaborins, salicyl alcohol derived aminoboranes, serve as efficient and mild iminium ion generators in the reductive amination of aldehydes with NaBH4. Using a diisopropylamino derivative, a variety of amines including secondary and primary amines, and ammonia can participate to the reductive amination in aprotic organic solvents without the use of acidic promoters.