单原子光催化作为一种重要的有机转化策略已受到越来越多的关注,其性能很大程度上取决于催化剂的设计。该方案最初涉及制造单原子光催化剂Ni / TiO 2,用于可见光诱导的酰胺的位点选择性磺化,以产生酰胺化砜,其中36个实例的收率高达99%。实验结果表明,该单原子光催化剂Ni / TiO 2可以在可见光下实现酰胺的定点磺化,从而构建α-酰胺基砜和β-丙酰胺基砜。重要的是,这种基于单原子光催化的合成系统显示出良好的可回收性,高周转数(最多18 963),对官能团的优异耐受性,并且可以容易地按比例放大并具有良好的效率。
FeCl<sub>3</sub>/TMSCl:
An Effective Catalytic System for the Conjugate Addition of Sodium <i>p</i>-Toluenesulfinate to α,β-Enones
作者:B. Sreedhar、M. Reddy、P. Reddy
DOI:10.1055/s-2008-1077967
日期:——
A new protocol for the β-sulfonation of α,β-unsaturated carbonyl compounds is described. The method employs FeCl3 as catalyst and TMSCl as additive for conjugate addition of sodium p-toluenesulfinate to enones.
作者:Harim Lechuga-Eduardo、Moises Romero-Ortega、Horacio F. Olivo
DOI:10.1002/ejoc.201501312
日期:2016.1
A synthetic strategy was developed for the preparation of α-ethynyl-α,β-epoxy-β-formyl- and α-ethynyl-α,β-epoxy-β-(hydroxymethyl)cyclohexanone fromcyclohexenone as a model study in a proposed synthesis of escobarines. This highly functionalized ring is found in the anti-TB cassane-type diterpenes escobarines A and B. Introduction of the β-hydroxymethyl group was carried out by reversing the chemical
开发了一种合成策略,用于从环己烯酮制备 α-乙炔基-α,β-环氧-β-甲酰基-和 α-乙炔基-α,β-环氧-β-(羟甲基)环己酮,作为拟议合成中的模型研究escobarines。这种高度官能化的环存在于抗结核 cassane 型二萜 escobarines A 和 B 中。 β-羟甲基的引入是通过使用磺酰基的阴离子和多聚甲醛的亲电攻击逆转烯酮的化学反应性来进行的. β-(羟甲基)环己烯酮的进一步官能化提供了所需的化合物。
A study of the intramolecular cyclization reactions of some derivatives of 3-arylsulfonyl cycloalkanols
作者:Stephen S Gonzales、Hollie K Jacobs、LuAnne E Juarros、Aravamudan S Gopalan
DOI:10.1016/0040-4039(96)01535-3
日期:1996.9
Carbonate and acyl derivatives of 3-arylsulfonylcyclohexanols and heptanols, upon deprotonation with LHMDS in THF at −78°C, undergo an intramolecular cyclization reaction to give bicyclic lactones or the corresponding acyl transfer products in synthetically useful yields. In contrast, the corresponding cyclopentyl derivatives show different reactivity.
Metal-free synthesis of γ-ketosulfones through Brønsted acid-promoted conjugate addition of sulfinamides
作者:Nicolas Gigant、Sami Kayal、Emmanuelle Drège、Delphine Joseph
DOI:10.1039/d3ra08675e
日期:——
A straightforward and general metal-free method has been developed to add sufinamide-derived sulfone units on Michael acceptors under mild conditions. This reaction enables the preparation of a large variety of original γ-ketosulfones, of which only a few synthetic methods have been reported. The mild reaction conditions used tolerate a wide diversity of functional groups and empower the implementation