Conjugates of Catecholamines. 5. Synthesis and β-Adrenergic Activity of N-(Aminoalkyl)norepinephrine Derivatives
作者:Allen B. Reitz、Etienne Sonveaux、Roberto P. Rosenkranz、Michael S. Verlander、Kenneth L. Melmon、Brian B. Hoffman、Yasio Akita、Neal Castagnoli、Murray Goodman
DOI:10.1021/jm50001a017
日期:1985.5
A novel series of N-aminoalkyl congeners and model derivatives of norepinephrine has been synthesized. Compounds that were structurally related to epinephrine were prepared from fully protected intermediates. Alternatively, isoproterenol-related compounds were synthesized via reductive amination of preformed methyl ketone derivatives with norepinephrine. The beta-adrenergic activities of these new compounds were assessed through measurement of intracellular cyclic AMP accumulation in S49 mouse lymphoma cells and displacement of iodocyanopindolol (ICYP) from membrane preparations. Congeners that contained an underivatized primary amine function exhibited virtually no activity in these assays. However, when this amine function was acylated (e.g., to an amide, carbamate, urea, sulfonamide, etc.), the products exhibited generally increased beta-adrenergic activity, which was, however, strongly dependent on the nature of the acylating group and also the length of the spacer. In particular, a benzyl carbamate derivative containing a branched, seven-carbon spacer group was 40 times more potent than isoproterenol in the in vitro S49 assay.
Synthesis of Linear Enamides and Enecarbamates
<i>via</i>
Photoredox Acceptorless Dehydrogenation
作者:Ritu、Daniel Kolb、Nidhi Jain、Burkhard König
DOI:10.1002/adsc.202201259
日期:2023.2.21
decatungstate (TBADT) as hydrogen atom transfer (HAT) agent and a cobaloxime co-catalyst for dihydrogen evolution for the dehydrogenative preparation of linear enamides and enecarbamates from saturated precursors. The substrate scope includes several natural products and drug derivatives. The reaction does not require noble metal catalysts, exhibits short reaction times compared to previous methods and is suitable