Synthesis and dopamine antagonist activity of 2-thioether derivatives of the ergoline ring system
摘要:
A series of 2-thioether derivatives of a number of clavine alkaloid (ergoline) ring systems have been synthesized and tested for dopamine antagonist activity. Of the compounds tested 2-(methylthio)-agroclavine (8,9-didehydro-6,8-dimethyl-2-(methylthio)ergoline) (6) was the most potent and had a profile of activity in animal models indicative of potential antipsychotic activity. The synthesis and biological activity of a number of metabolites of 6, including the 13-hydroxy derivative, are also reported.
Total Syntheses of Pyroclavine, Festuclavine, Lysergol, and Isolysergol via a Catalytic Asymmetric Nitro-Michael Reaction
作者:Subhajit Bhunia、Saikat Chaudhuri、Alakesh Bisai
DOI:10.1002/chem.201702459
日期:2017.8.22
stereocenters is reported. The reaction takes advantage of thiourea‐catalyzed intramolecular nitronate addition onto α,β‐unsaturated ester to afford exceptional levels of enantioselectivity (up to 97 % ee) with moderate diastereoselectivity (up to 4:1). Using this method, a cross‐conjugated ester was synthesized in few steps, from which a 6‐endo‐trig cyclisation led to the formation of all required functionalities
Total Syntheses of Festuclavine, Pyroclavine, Costaclavine, <i>epi</i>-Costaclavine, Pibocin A, 9-Deacetoxyfumigaclavine C, Fumigaclavine G, and Dihydrosetoclavine
total synthesis of eight ergot alkaloids is reported. The approach allows the first total syntheses of pyroclavine, pibocin A, 9-deacetoxyfumigaclavine C, and fumigaclavine G and also enables the efficient synthesis of festuclavine, costaclavine, epi-costaclavine, and dihydrosetoclavine. The main feature of the synthesis is the use of an unprecedented Pd-catalyzed intramolecular Larockindole annulation/Tsuji–Trost
作者:Saikat Chaudhuri、Subhajit Bhunia、Avishek Roy、Mrinal K. Das、Alakesh Bisai
DOI:10.1021/acs.orglett.7b03683
日期:2018.1.5
Biomimetic totalsyntheses of either enantiomers of a number of ergot alkaloids, chanoclavine I (1b), chanoclavine I aldehyde (1c), pyroclavine (1e), festuclavine (1f), pibocin A (1g), 9-deacetoxyfumigaclavine C (1h), and fumigaclavine G (1i), have been achieved from seco-agroclavine (1a). The advanced intermediate for seco-agroclavine (1a) was synthesized via a key thiourea-catalyzed intramolecular
Zur Stereochemie der Mutterkornalkaloide vom Agroclavin- und Elymoclavin-Typus. 46. Mitteilung über Mutterkornalkaloide
作者:E. Schreier
DOI:10.1002/hlca.19580410708
日期:——
Durch die auf verschiedenen, sterisch eindeutigen Wegen durchgeführte chemische Verknüpfung des Mutterkornalkaloids Agroclavin mit Elymoclavin und D-Dihydro-lysergsäure(I) wurde bewiesen, dass die Ringe C und D im Agroclavin gleiche trans-Verknüpfung wie in der D-Dihydro-lysergsäure(I) aufweisen.