Synthesis of 13C-Dehydrocoelenterazine and NMR Studies on the Bioluminescence of a Symplectoteuthis Model
摘要:
The bioluminescence of luminous squid (Symplectoteuthis oualaniensis) is presumed to be initiated by the addition of the sulfhydryl residue of a photoprotein to dehydrocoelenterazine (DCL). To clarify this step, a novel synthetic route was established to label DCL with C-13. Dithiothreitol (DTT) and glutathione (GSH) were used as photoprotein models. The addition of DTT and GSH to C-13-labeled DCL gave luminous chromophores. Its structures were confirmed by NMR and MS spectrometry. The DTT adduct emitted light under alkaline condition to produce an oxidized compound. Thus we succeeded in modeling the bioluminescence of a photoprotein with DTT. (C) 2000 Elsevier Science Ltd. All rights reserved.
Nazarov cyclization of divinyl ketones bearing an ester group at the β-position: a remarkable effect of α-substitution and alkene geometry on regioselectivity
these observations are an aromatic group at the α-position with E-olefin geometry provides a cyclopentenone in which the double bond is not in conjugation with an ester, whereas Z-olefin provides a cyclopentenone in which the double bond is in conjugation with an ester; and divinyl ketones bearing an ester group at the β-position and an alkyl group at the α-position with E-olefin geometry provide a cyclopentenone
A new regioselective approach to the synthesis of alpha-aryl enones is reported. This represents an important application of the Kuwajima-Urabe protocol toward the synthesis of this simple albeit complex functional array. Several a-aryl enones were synthesized by the palladium catalyzed arylation of triethylsilylenol ethers of enones with high regioselectivity and broad scope, utilizing sterically encumbered electron-rich phosphine ligands to drive the reaction.
Kroehnke; Vogt, Justus Liebigs Annalen der Chemie, 1954, vol. 589, p. 52
作者:Kroehnke、Vogt
DOI:——
日期:——
Becher, Jan; Brondum, Klaus; Hansen, Poul, Journal of Heterocyclic Chemistry, 1988, vol. 25, p. 795 - 798
作者:Becher, Jan、Brondum, Klaus、Hansen, Poul、Jacobsen, Jens Peter
DOI:——
日期:——
BECHER, JAN;VRZHUSTONDUM, KLAUS;NANSEN, POUL;JACOBSEN, JENS PETER, J. HETEROCYCL. CHEM., 25,(1988) N 3, C. 795-798
作者:BECHER, JAN、VRZHUSTONDUM, KLAUS、NANSEN, POUL、JACOBSEN, JENS PETER