Functionalised pyridine sulfolenes as precursors to pyridine o-quinodimethane derivatives and their [4+2] cycloadducts
作者:Steven L Cappelle、Ilse A Vogels、Luc Van Meervelt、Frans Compernolle、Georges J Hoornaert
DOI:10.1016/s0040-4039(01)00566-4
日期:2001.5
An efficient route has been developed for the synthesis of polysubstituted 6,6-dioxo-6,7-dihydrothieno[3,4-b]pyridine 5. This pyridine sulfolene compound serves as an excellent precursor for the corresponding pyridine o-quinodimethane. This reactive species is generated via thermal extrusion of sulfur dioxide and can be trapped in situ with both electron-rich and electron-deficient dienophiles.
已经开发出一种有效的途径来合成多取代的6,6-二氧代-6,7-二氢噻吩并[3,4- b ]吡啶5。该吡啶环丁砜化合物用作相应的吡啶邻喹啉甲烷的极好的前体。这种反应性物质是通过热挤压二氧化硫产生的,可以与富电子和缺电子的亲二烯体原位捕集。