Didehydrogeranylgeranyl (ΔΔGG): A Fluorescent Probe for Protein Prenylation
摘要:
The first intrinsically fluorescent analog of geranylgeraniol, (2E,6E,8E,10E,12E,14E)-geranylgeraniol (all-trans-DeltaDeltaGGOH.1) has been synthesized stereoselectively and shown to substitute for the geranylgeranyl (GG) moiety in prenyl transferase reactions and in protein-ligand binding assays. All-trans-DeltaDeltaGGOH 1 showed blue fluorescence in methanol, with lambdaex = 310 nm and lambdaem = 410 nm (epsilon310 = 2.4 x 104 M-1 cm-1), but was only weakly fluorescent in aqueous solution. The prenyl transferase efficiency for DeltaDeltaGGPP 2 as a substrate for yeast protein geranylgeranyl transferase (PGGTase-I) was 60% relative to that for GGPP. The binding of DeltaDeltaGG-AcCysMe 3 to the recombinant Rho GTPase dissociation inhibitor (RhoGDI) had a KD of 15.1 +/- 1.2 muM, 6-fold lower than the affinity of GG-AcCysMe. Thus, the DeltaDeltaGG moiety is a novel fluorophore suitable for studying the interaction and subcellular localization of prenylated small GTPase proteins in signaling complexes.
SnCl2/KI-Mediated Allylation Reactions of Formaldehyde in Water
作者:Mei-Huey Lin、Long-Zhi Lin、Tsung-Hsun Chuang
DOI:10.1055/s-0030-1260757
日期:2011.8
An efficient procedure for SnCl2/KI-mediated allylation reactions of formaldehyde with a variety of allylic bromides in aqueous solution is reported. Under conditions developed in this effort, various homoallylic alcohols and 2-halohomoallylic alcohols are produced in good to excellent yields.
Facile synthesis of γ-alkylidenebutenolides from Morita–Baylis–Hillman adducts
作者:Bo Ram Park、Ko Hoon Kim、Jin Woo Lim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2011.11.001
日期:2012.1
An expedient syntheticprocedure of γ-alkylidenebutenolides was developed via a sequential indium-mediated Barbier-type reaction of Morita–Baylis–Hillman bromide with aldehyde, lactonization, and double-bond isomerization. Various γ-alkylidenebutenolides including bovolide and its derivatives were synthesized in good overall yields.
A procedure has been developed for the regioselective, high yielding synthesis of 2H-indazoles.
已开发出一种用于选择性合成2H-吲唑的高产率程序。
Synthesis and Biological Evaluation of Novel Benzoxaboroles as Potential Antimicrobial and Anticancer Agents
作者:J. Sravan Kumar、M. A. Alam、Shirisha Gurrapu、Grady Nelson、Michael Williams、Michael A. Corsello、Joseph L. Johnson、Subash C. Jonnalagadda、Venkatram R. Mereddy
DOI:10.1002/jhet.1777
日期:2013.7
Several novelbenzoxaborole derivatives were synthesized starting from 2‐formylphenylboronic acid utilizing Baylis–Hillman reaction, Barbier allylation, Passerini reaction, and aldol reaction protocols as the key step. All the synthesized benzoxaboroles have been evaluated for their antibacterial, antifungal, and anticancer activities.