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。
Diels–Alder reactions with pyridine o-quinodimethanes generated from pyridine sulfolenes
作者:Steven L Cappelle、Ilse A Vogels、Tom C Govaerts、Suzanne M Toppet、Frans Compernolle、Georges J Hoornaert
DOI:10.1016/s0040-4020(02)00348-4
日期:2002.5
as excellent precursors for generation of the corresponding pyridine o-quinodimethanes. Following thermal extrusion of sulfur dioxide, these reactive species can be trapped in situ with electron rich, neutral, and electron deficient dienophiles. The regio and stereochemical structure of the resulting adducts was determined by NMR analysis.
已经开发了合成多取代的6,6-二氧代-6,7-二氢噻吩并[3,4- b ]吡啶3的有效途径,其用作产生相应的吡啶邻-喹二甲烷的极好的前体。在热挤出二氧化硫之后,这些反应性物质可以被富电子,中性和缺电子的亲二烯体原位捕获。通过NMR分析确定所得加合物的区域和立体化学结构。