Piperazine as a Linker for Incorporating the Nitric Oxide-Releasing Diazeniumdiolate Group into Other Biomedically Relevant Functional Molecules
作者:Joseph E. Saavedra、Melissa N. Booth、Joseph A. Hrabie、Keith M. Davies、Larry K. Keefer
DOI:10.1021/jo9901539
日期:1999.7.1
in which E = Na and R = dansyl and "MOM-PIPERAZI/NO" (E = CH3OCH2, R = H), whose half-life for NO release was estimated as 17 days. The latter agent has made possible the conversion of poly(vinyl chloride) and phosphatidylethanolamine to NO-releasing derivatives. This chemistry should allow introduction of diazeniumdiolate groups into a wide variety of natural products, drugs, polymers, and other molecules
已经设计了合成程序以利用双官能胺哌嗪 (pip) 作为能够将释放一氧化氮 (NO) 的二氮烯二醇官能团 [N(O)NO] 连接到多种生物医学有用分子的连接体。其中一个氨基带有二氮烯二醇酯,它可以根据需要在氧上被取代以控制其离解为 NO,而另一个用于提供适合与需要 NO 供体能力的分子共价键合的位点。结构为 R-pip-N(O)[分子式:见正文]NOE 的 N,N'-二取代哌嗪是通过使用氨基的亲核特性或通过将其转化为亲电部分与亲核中心反应来制备的在要衍生的分子中。据报道,其中 E = CH3 和 R 基团与 N'-氮结合的例子:通过酰胺键与药物布洛芬和氨基酸衍生物 N-乙酰甲硫氨酸的羧基相连;通过尿素分组到受保护赖氨酸的ε-氨基;通过氨基甲酸酯键连接到聚(乙二醇);并通过替换烟酰胺和腺苷的 NH2 氮。通过引入 BrCH2CH2OSO2Cl 作为一种新型、高效的溴乙基化剂,促进了 E = 乙
Thermal decomposition of methylated γ-thiobutyrolactones: a photoelectron spectroscopic study
作者:Yek Tann Chua、Chupp Yew Mok、Hsing Hua Huang、Igor Novak、Siu Choon Ng
DOI:10.1039/p29960000577
日期:——
The thermaldecomposition of γ-thiovalerolactone, α-methyl-γ-thiobutyrolactone and β-methyl-γ-thiobutyrolactone has been studied in a gaseous flow system, by monitoring the changes in the photoelectron spectra recorded during the course of the reactions. Three modes of decomposition were observed, two involve loss of carbon monoxide (decarbonylation) and one involves loss of carbonyl sulfide (decarboxylation)
Preparation and characterization of bicyclic amide acetals and monothioacetals
作者:J Peter Guthrie、Roger T Gallant、Michael C Jennings
DOI:10.1139/v03-204
日期:2004.2.1
We have prepared and characterized new examples of 5-substituted-1-aza-4,6-dioxabicyclo(3.3.0)octanes (bicyclic amide acetals) and examples of the new heterocyclic system, 5-substituted-1-aza-4-oxa-6-thiabicyclo(3.3.0)oc- tanes (bicyclic amide monothioacetals). Detailed analysis of NMR coupling constants and X-ray structure determination for an example of each class of compound established the stereochemistry
我们已经制备并表征了 5-取代-1-氮杂-4,6-二氧杂双环 (3.3.0) 辛烷(双环酰胺缩醛)的新实例和新杂环系统的实例,5-取代-1-氮杂-4- oxa-6-thiabicyclo(3.3.0)octanes(双环酰胺单硫缩醛)。对每一类化合物的一个例子的 NMR 耦合常数和 X 射线结构测定的详细分析确定了这些环系统的立体化学和构象。
First synthesis and characterization of vinylselenols and vinyltellurols
Vinylselenols and vinyltellurols have been prepared by slow
addition of tributyltin hydride to the corresponding divinyldiselenide or
divinylditelluride in tetraglyme.