Building with Cubane-1,4-diyl. Synthesis of Aryl-Substituted Cubanes, p-[n]Cubyls, and Cubane-Separated Bis(arenes)1
摘要:
On treatment with an organolithium 1,4-diiodocubane generates cubane-1,4-diyl, a highly reactive species, shown here to be a versatile precursor to numerous aryl substituted cubanes, available now for the first time in high yield. The diyl is demonstrated to provide a good route to bicubyl and its derivatives. A kind of "living polymerization" of the diyl is developed to give the p-[n]cubyls. These oligomers are rigid rods made up of cubanes linked together at the 1 and 4 positions, each cubane adding similar to 4.15 Angstrom to the length. The properties of these rods, some more than 15 Angstrom long, are discussed, as are methods for modifying their solubility. X-ray crystallographic analyses of some of these compounds an presented, with emphasis on packing parameters.
通过从 1-bromo-4-取代的立方烷中提取溴原子,产生了一系列 4-取代的立方自由基。EPR 观察表明,cubyl 自由基从三乙基硅烷的乙基中提取二级氢原子,主要通过二级组合反应衰变。在-90 o C 时,叔丁氧基从立方烷中提取氢原子的速度至少比环丙烷快26 倍。立方烷上的吸电子取代基大大降低了这一速度。叔丁氧基自由基选择性地从甲基立方烷中提取笼氢而不是伯甲基氢
Cubanes in Medicinal Chemistry: Synthesis of Functionalized Building Blocks
作者:Joanna Wlochal、Robert D. M. Davies、Jonathan Burton
DOI:10.1021/ol501750k
日期:2014.8.15
cubane-1,4-dimethylester. A range of synthetic methods have been applied to prepare these cubane building blocks with one or two functional handles to allow easy incorporation into existing medicinal chemistry programs.
4-Substituted Cubylcarbinylamines: A New Class of Mechanism-Based Monoamine Oxidase B Inactivators
作者:Joseph J. P. Zhou、Jianchang Li、Suhbash Upadhyaya、Philip E. Eaton、Richard B. Silverman
DOI:10.1021/jm9606249
日期:1997.3.1
time-dependent, irreversible inactivators of monoamine oxidase B (MAO B). Substrate protects the enzyme from inactivation, but beta-mercaptoethanol does not, suggesting that these compounds are mechanism-based inactivators. All three compounds were also substrates for MAO B with partition ratios ranging from 152 to 536. The 4-substituted analogues were more potentinactivators than the unsubstituted analogue
The reactions of 1,4-dihalocubanes with organolithiums. The case for 1,4-cubadiyl
作者:Philip E. Eaton、John Tsanaktsidis
DOI:10.1021/ja00158a063
日期:1990.1
La lithiation suivie par une carbomethoxylation de dihalogeno-1,4 cubane fournit des derives de cubanecarboxylate-1, cubanedicarboxylate-1,4, de dicubyle-1,4' carboxylate-1, dicubyle-1,4' dicarboxylate-1,4 de methyle ou dimethyle
La lithiation suvie par une carbomethoxylation de dihalogeno-1,4 cubane Fournit des甲基或二甲基
Synthesis of alkynylcyclooctatetraenes and alkynylcubanes
作者:Philip E. Eaton、Daniel Stossel
DOI:10.1021/jo00017a028
日期:1991.8
The couplings of a variety of iodocubanes with terminal acetylenes in refluxing NEt3 in the presence of Cu(I) and Pd(0) were examined. The products, isolated in about 50% yield, were not alkynylcubanes but were instead the first examples of alkynyl-1,3,5,7-cyclooctatetraenes. The first examples of alkynylcubanes (cubylacetylenes) were themselves synthesized in modest yield by Negishi's procedure from alkyl cubyl ketones. Cubylacetylenes were shown to be stable under Heck-like coupling conditions and potentially useful thereby for the introduction of the cubylacetylene moiety into complex systems.