Total Syntheses of (−)-Hibiscone C and Lysergine: A Cyclization/Fragmentation Strategy
作者:Yandong Lu、Haosen Yuan、Shijie Zhou、Tuoping Luo
DOI:10.1021/acs.orglett.6b03778
日期:2017.2.3
The first asymmetric total synthesis of (−)-hibiscone C and a concise synthesis of ergot alkaloid lysergine are described. Both syntheses were achieved using the radicalcyclization/fragmentation strategy. This cascade reaction enabled the application of the strained bicycle as a synthon for the synthesis of highly substituted decalins in an efficient and stereoselective manner.
作者:John S. Ward、Ray W. Fuller、Leander Merritt、Harold D. Snoddy、Jonathan W. Paschal、Norman R. Mason、J. S. Horng
DOI:10.1021/jm00403a007
日期:1988.8
The synthesis and serotonin receptor subtype affinity of a series of ergolines are described. High selectivity for the 5-HT1 subtype was found with a number of 8-substituted (3 beta, 5 beta)-9,10-didehydro-6-methylergolines. The more potent and selective of these compounds increased the concentration of serotonin and decreased the concentration of 5-HIAA in rat brain and increased corticosterone concentration in rat serum. Oral administration of 13, (3 beta)-2,3-dihydrolysergine, produced long-lasting decreases in serotonin turnover. Compound 13 lacked substantial dopaminergic activity as measured by its effects on dopamine turnover in whole brain or striatum and its affinity for alpha-adrenergic binding sites was significantly less than for 5-HT1 binding sites. The increases in serum corticosterone concentrations produced by 13 were not blocked by the serotonin uptake inhibitor fluoxetine or by the serotonin synthesis inhibitor p-chlorophenylalanine, suggesting that 13 exerts its effects through direct stimulation of serotonin receptors.