Photocatalytic Three-Component Umpolung Synthesis of 1,3-Diamines
作者:Thomas Rossolini、Jamie A. Leitch、Rachel Grainger、Darren J. Dixon
DOI:10.1021/acs.orglett.8b02923
日期:2018.11.2
visible-light-mediated photocatalytic umpolung synthesis of 1,3-diamines from in situ-generated imines and dehydroalanine derivatives is described. Pivoting on a key nucleophilic addition of photocatalytically generated α-amino radicals to electron-deficient alkenes, this three-component coupling reaction affords 1,3-diamines efficiently and diastereoselectively. The mild protocol tolerates a wide variety
NaI readily mediated oxidative aromatization of Hantzsch 1,4-dihydropyridines with hydrogen peroxide at room temperature: A green procedure
作者:D. Shahabi、M. A. Amrollahi、A. A. Jafari
DOI:10.1007/bf03246562
日期:2011.12
The oxidative conversion of 1,4-dihydropyridines to give the corresponding pyridine derivatives in excellent yields was easily effected using the catalytic amount of NaI in combination with H2O2 (30%) as a green external oxidant. The process is highly green wherein the solid products are easily filtered out after the addition of ice-water to the reaction mixture. This non-transition metal catalyst
使用催化量的NaI和H 2 O 2(30%)作为绿色外部氧化剂,可以轻松实现1,4-二氢吡啶的氧化转化,从而以优异的收率得到相应的吡啶衍生物。该方法是高度绿色的,其中在将冰水添加到反应混合物中之后,容易将固体产物滤出。这种非过渡金属催化剂具有成本效益,提供了简单的后处理和易于分离的产物。
Intermolecular [2 + 2] Cycloaddition of 1,4-Dihydropyridines with Olefins via Energy Transfer
作者:Chengfeng Wang、Zhan Lu
DOI:10.1021/acs.orglett.7b02881
日期:2017.11.3
A highly regio- and diastereoselective visible-light-promoted [2 + 2] cycloaddition between readily available 1,4-dihydropyridines and olefins has been developed. This strategy is operationally simple and atom-economical and enables the construction of strained polysubstituted 2-azabicyclo[4.2.0]octanes with three all-carbon quaternary centers with good functional group tolerance. These products can