Synthesis and Evaluation of Substrate Analogues as Mechanism-Based Inhibitors of Type II Isopentenyl Diphosphate Isomerase
作者:Joel R. Walker、Steven C. Rothman、C. Dale Poulter
DOI:10.1021/jo702061d
日期:2008.1.1
dimethylallyl diphosphate, contains a tightly bound molecule of FMN. To probe the mechanism of the reaction, cyclopropyl and epoxy substrate analogues, designed to be mechanism-based irreversible inhibitors, were synthesized and evaluated with IDI-2 from Thermus thermophilus. The cyclopropyl analogues were alternative substrates. The epoxy analogue was an irreversible inhibitor, with kI = 0.37 ± 0.07 min-1
催化异戊烯基二磷酸酯和二甲基烯丙基二磷酸酯相互转化的2型异戊烯基二磷酸异构酶(IDI-2)包含FMN的紧密结合分子。为了探测反应的机理,合成了被设计为基于机理的不可逆抑制剂的环丙基和环氧底物类似物,并用嗜热栖热菌(Thermus thermophilus)的IDI-2进行了评估。环丙基类似物是替代底物。环氧类似物是不可逆的抑制剂,k I = 0.37±0.07 min -1,K I = 1.4±0.3μM。LC-MS研究表明形成了环氧化物-FMN加合物。
The Photochemistry of 2-Cyclopentenyl Methyl Ketones
3-phenyl-2-cyclopentenyl methylketones (15–18, 30, 31) undergo a 1,3-acetyl shift on direct irradiation, and the oxa-di-π-methane rearrangement to photochemically non-interconverting endo and exo bicyclo-[2.1.0]pentyl methylketones on tripletsensitization. Exceptions include the 2-methyl-3-phenyl-2-cyclopentenyl methylketone 32 and the 1-phenyl-2-cyclo-pentenyl methylketone 44 which are unreactive
Carbene-Catalyzed Formal [3+3] Cycloaddition Reaction for Access to Substituted 2-Phenylbenzothiazoles
作者:Zhibin Ni、Chengli Mou、Xun Zhu、Puying Qi、Song Yang、Yonggui Robin Chi、Zhichao Jin
DOI:10.1002/ejoc.201901773
日期:2020.1.31
carbene‐catalyzed oxidative cycloadditionreaction is developed for efficient access to multi‐functionalized 2‐phenylbenzothiazoles. A broad scope of heavily substituted arenes bearing 2‐benzothiazole groups have been prepared in good to excellent yields. The remote C(sp2)–H bond in the substituted arene products can be regioselectively activated by Pd catalysts with the direction of the 2‐benzothiazole groups
Vinylcyclopropylacyl and polyeneacyl radicals. Intramolecular ketene alkyl radical additions in ring synthesis
作者:Beno�t De Boeck、Nicola M. A. Herbert、Nicole M. Harrington-Frost、Gerald Pattenden
DOI:10.1039/b413816n
日期:——
intramolecular cyclisations of their ketene alkyl radical intermediates. Under the same radical-initiating conditions the selenyl esters derived from o-vinylbenzoic acid and o-vinylcinnamic acid undergo intramolecularcyclisations producing 1-indanone and 5,6-dihydrobenzocyclohepten-7-one respectively in 60-70% yields. A tandem radical cyclisation from the alpha,beta,gamma,delta-diene selenyl ester 31 provides
Syntheses of Seven-Membered Rings: Ruthenium-Catalyzed Intramolecular [5+2] Cycloadditions
作者:Barry M. Trost、Hong C. Shen、Daniel B. Horne、F. Dean Toste、Bernhard G. Steinmetz、Christopher Koradin
DOI:10.1002/chem.200401065
日期:2005.4.8
The Ru-catalyzed intramolecular [5+2] cycloaddition of cyclopropylenynes is investigated with respect to the regio- and diastereoselectivity as well as the functional group compatibility of the reaction. Evidence for the mechanism as occurring through a ruthenacyclopentene intermediate is elucidated from 1) the study of the diastereoselectivity of the cycloaddition; 2) the effect of variation of substituents