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。