Cesium fluoride-promoted esterification of carboxylic acids. A practical alternative to the diazomethane method and direct conversion of organotin carboxylates
Substituted uracil derivatives as potent inhibitors of poly(ADP-ribose)polymerase-1 (PARP-1)
作者:Henning Steinhagen、Michael Gerisch、Joachim Mittendorf、Karl-Heinz Schlemmer、Barbara Albrecht
DOI:10.1016/s0960-894x(02)00602-9
日期:2002.11
A new class of PARP-1inhibitors, namely substituted fused uracil derivatives were synthesised. Starting from a derivative with an IC(50)=2microM the chemical optimisation program led to compounds with more than a 100-fold increase in potency (IC(50)<20nM). Additionally, physicochemical and pharmacokinetic properties were evaluated. It could be shown that compounds bearing a piperazine or phenyl substituted
Negatively substituted halomethanes were allylated easily by allyltin compounds via radical chain reaction involving SH′ process. Aryl, aralkyl, and alkyl halides underwent similar chain reactions only when the tin compound was charged in excessive amounts.
Reaction of phenyl benzoate with tri-n-butyltinhydride has been found to give mainly toluene, benzyl benzoate, tri-n-butyltin phenoxide and tri-n-butyltin benzoate. Possible reaction paths leading to these products are discussed. A SH2 mechanism involving initial attack of tri-n-butyltin radical at the ethereal oxygen atom of the ester with displacement of the benzoyl moiety appears to be consistent
已发现苯甲酸苯酯与氢化三正丁基锡的反应主要产生甲苯,苯甲酸苄酯,苯酚三正丁基锡和苯甲酸三正丁基锡。讨论了导致这些产物的可能的反应路径。AS H 2机理涉及三正丁基锡自由基在酯的醚氧原子上的初始进攻以及苯甲酰基部分的置换,这似乎与观察到的实验证据是一致的。
Preparation and reactions of some sulfur-substituted tetraorganotin compounds
作者:Donald J. Peterson
DOI:10.1016/s0022-328x(00)84772-5
日期:1971.1
Some sulfur-substituted organotin compounds, R3SnCH2X, where X = SCH3, SO2C4H9-n, SO2C6H5, S+(CH3)2Z−, etc., have been synthesized and studied with regard to their solvolytic and “organometallic-like” behavior. Reactions of the organotin compounds with substrates known to be reactive toward classical organometalliccompounds tend to place these materials by comparison on the lower end of the reactivity
The preparation and tin-119m mössbauer spectra of tri-n-butylstannyl esters of heterocyclic and substituted aromatic carboxylic acids
作者:David W. Allen、John S. Brooks、Ralph Formstone、Alan J. Crowe、Peter J. Smith
DOI:10.1016/s0022-328x(00)93542-3
日期:1978.8
The 119mSn Mössbauer and infrared data are reported for fifteen tributyltin carboxylates. Although the Mössbauer data at 80 K shows them all to be pentacoordinate polymers, the infrared data indicates that, at room temperature, some of the compounds exist as tetracoordinate monomeric species.
报道了15种羧酸三丁基锡的119 m SnMössbauer和红外数据。尽管在80 K下的Mössbauer数据显示它们都是五配位聚合物,但红外数据表明,在室温下,某些化合物以四配位单体形式存在。