Synthesis of α-Quaternary Bicyclo[1.1.1]pentanes through Synergistic Organophotoredox and Hydrogen Atom Transfer Catalysis
作者:Jeremy Nugent、Alistair J. Sterling、Nils Frank、James J. Mousseau、Edward A. Anderson
DOI:10.1021/acs.orglett.1c03346
日期:2021.11.5
Bicyclo[1.1.1]pentanes (BCPs) are important in drug design as sp3-rich bioisosteres of arenes and tert-butyl groups; however, the preparation of BCPs with adjacent quaternary carbons is barely known. We report a facile synthesis of α-quaternary BCPs using organophotoredox and hydrogen atom transfer catalysis in which α-keto radicals, generated through oxidation of β-ketocarbonyls, undergo efficient
Probes for narcotic receptor mediated phenomena. 12. cis-(+)-3-Methylfentanyl isothiocyanate, a potent site-directed acylating agent for .delta. opioid receptors. Synthesis, absolute configuration, and receptor enantioselectivity
作者:Terrence R. Burke、Arthur E. Jacobson、Kenner C. Rice、J. V. Silverton、William F. Simonds、Richard A. Streaty、Werner A. Klee
DOI:10.1021/jm00156a030
日期:1986.6
4 (SUPERFIT) was shown to be highly potent and specific for acylation of delta opioid receptors (to the exclusion of mu) in rat brain membranes like its achiral prototype FIT and was about 10 times as potent as the latter in this assay. The (+)-4 was about 5 times as potent as FIT in acylation of delta receptors in NG108-15 neuroblastoma X glioma hybrid cells and about 50 times as potent as its enantiomer