EWG-containing thiophene-1,1-dioxides were found to be very active dienophiles in reactions with 1,3-dienes to afford corresponding cycloadducts in mild conditions. A chemo-, regio- and stereoselective cycloaddition was observed. Reaction resulted in formation of derivatives of tetrahydrobenzothiophene-1,1-dioxides in high yields.
发现含有EWG的
噻吩-1,1-二氧化物在与1,3-二烯的反应中是非常活泼的亲二烯体,在温和条件下可提供相应的环加合物。观察到
化学,区域和立体选择性环加成。反应导致高产率地形成四氢
苯并噻吩-1,1-二氧化物的衍
生物。