Synthesis and reactivity of α-sulfenyl-β-chloroenones, including oxidation and Stille cross-coupling to form chalcone derivatives
作者:Aoife M. Kearney、Linda Murphy、Chloe C. Murphy、Kevin S. Eccles、Simon E. Lawrence、Stuart G. Collins、Anita R. Maguire
DOI:10.1016/j.tet.2021.132091
日期:2021.5
The synthesis of a range of novel α-sulfenyl-β-chloroenones from the corresponding α-sulfenylketones, via a NCS mediated chlorination cascade, is described. The scope of the reaction has been investigated and compounds bearing alkyl- and arylthio substituents have been synthesised. In most instances, the Z α-sulfenyl-β-chloroenones were formed as the major products, while variation of the substituent
描述了通过NCS介导的氯化级联反应从相应的α-亚磺酰基酮合成一系列新型α-亚磺酰基-β-氯烯酮的方法。已经研究了反应范围,并且已经合成了带有烷基和芳硫基取代基的化合物。在大多数情况下,Ž α-硫基-β-chloroenones形成作为主要产品,而在β碳位上的取代基的变化导致了立体选择性的改变。的Stille交叉偶联与Ž导致的选择性形成α-硫基-β-chloroenones Ž硫基查耳酮,而Ë α-硫基-β-chloroenones没有在相同条件下发生反应。Z的氧化α-硫基-β-chloroenones随后异构化,导致Ë α -亚磺酰基- β-chloroenones。的Stille交叉偶联与Ë α -亚磺酰基- β-chloroenones产生的ë亚磺酰基查耳酮。无论是ë或Ž亚磺酰基的查耳酮可以通过改变氧化和的Stille交叉偶联的序列来获得。