Formation of meta-arylsulfanyl- and meta-(alkylsulfanyl)phenols from cyclohexane-1,3-diones
作者:Nhan Do Van Thanh、Subrata Patra、Derrick L.J. Clive
DOI:10.1016/j.tet.2018.06.059
日期:2018.8
respectively. These compounds are easily brominated at C-2 by using NBS in MeCN; exposure to DBU in MeCN at room temperature then causes aromatization to afford meta-arylsulfanyl- and meta-(alkylsulfanyl)phenols.
环己烷-1,3-二酮与TsCl / Et 3 N的反应,然后在MeCN中用芳基或烷基硫醇和K 2 CO 3处理所得的3-(甲苯磺酰氧基)环己-2-烯-1-酮(芳基硫烷基)环己-2-烯-1-酮或3-(烷基硫基)环己-2-烯-1-酮。通过在MeCN中使用NBS,这些化合物很容易在C-2处溴化;暴露于DBU在MeCN在室温下然后使得芳构化,得到的元-arylsulfanyl-和元- (烷硫基)苯酚。
Asymmetric Allylic Alkylation of Cyclic Vinylogous Esters and Thioesters by Pd-Catalyzed Decarboxylation of Enol Carbonate and β-Ketoester Substrates
作者:Barry M. Trost、Robert N. Bream、Jiayi Xu
DOI:10.1002/anie.200504421
日期:2006.5.5
6-Exo-spiro (Alkoxycarbonylamino)methyl Radical Cyclization: Highly Regio- and Stereoselective Synthesis of (−)-Sibirine
作者:Masato Koreeda、Yamin Wang、Liming Zhang
DOI:10.1021/ol026671e
日期:2002.9.1
[reaction: see text] The (methoxycarbonylamino)methylradical can be readily generated from its PhSe precursor and undergoes preferential 6-exo-spiro cyclization when PhSO(2) is attached at the distal alkene carbon. This property was applied to the synthesis of the racemic and optically active spirocyclic alkaloid sibirine.