Novel lapachone compounds and methods of use thereof
申请人:Ashwell Mark A.
公开号:US20090105166A1
公开(公告)日:2009-04-23
The present invention provides novel tricyclic spiro-oxathiine naphthoquinone derivatives, a synthetic method for making the derivatives, and the use of the derivatives to induce cell death and/or to inhibit proliferation of cancer or precancerous cells. The naphthoquinone derivatives of the present invention are related to the compound known as β-lapachone (3,4-dihydro-2,2-dimethyl-2H-naphtho(1,2-b)pyran-5,6-dione).
Reaction of Diphenylsulfonium Methylide with Carbonyl Compounds in Non-Basic Media
作者:Kazuhito Hioki、Shohei Tani、Yoshiro Sato
DOI:10.1055/s-1995-3970
日期:1995.6
Diphenylsulfonium methylide was formed by fluoride-induced desilylation of diphenyl[(trimethylsilyl)methyl]sulfonium triflate with cesium fluoride in dimethyl sulfoxide and allowed to react with carbonyl compounds in situ to give oxiranes.
作者:Sarah A. Kavanagh、Alessandro Piccinini、Stephen J. Connon
DOI:10.1002/adsc.201000255
日期:2010.10.9
demonstrated for the first time that a sulfide catalyst, utilised at 20 mol% loading, can promote methylene transfer to ketones in the presence of methyl triflate and an organic base. This metal-free methodology is of broad scope – both aliphatic and aromatic ketones (including trifluoromethyl ketones) can be converted to synthetically useful terminal epoxides in excellent yields at room temperature.
Bimetallic Radical Redox-Relay Catalysis for the Isomerization of Epoxides to Allylic Alcohols
作者:Ke-Yin Ye、Terry MCallum、Song Lin
DOI:10.1021/jacs.9b04993
日期:2019.6.19
exceptionally high reactivity. Strategically, achieving synthetically useful transformations mediated by organic radicals requires both efficient initiation and selective termination events. Here, we report a new catalytic strategy, namely, bimetallic radical redox-relay, in the regio- and stereoselectiverearrangement of epoxides to allylic alcohols. This approach exploits the rich redox chemistry of Ti
有机自由基通常是具有异常高反应性的短寿命中间体。从战略上讲,实现由有机自由基介导的合成有用的转化需要有效的引发和选择性终止事件。在这里,我们报告了一种新的催化策略,即双金属自由基氧化还原继电器,用于环氧化物向烯丙醇的区域和立体选择性重排。这种方法利用了 Ti 和 Co 配合物的丰富氧化还原化学,并将还原性环氧化物开环(引发)与氢原子转移(终止)相结合。至关重要的是,在影响关键的成键和断裂事件时,Ti 和 Co 催化剂彼此进行质子转移/电子转移以实现周转,从而构成真正协同的双催化系统。
Isomerization of Aziridines to Allyl Amines via Titanium and Chromium Cooperative Catalysis
作者:Chengbo Yao、Alana D. N. Williams、Yiting Gu、Jack R. Norton
DOI:10.1021/acs.joc.1c03054
日期:2022.4.1
cooperative catalyst isomerizes aziridines to allyl amines under mild conditions. The reaction tolerates a broad range of aziridines with various nitrogen substituents. The titanium catalyst is most successful in opening 1,2-disubstituted aziridines, forming radical intermediates in a highly regioselective manner. The chromium catalyst appears to abstract an H• from these radical intermediates and