The first aza-Diels-Alder reactions of arylsulfonyl isocyanates with thio-substituted 1,3-dienes via the 3-sulfolene precursors 1 gave the cyclized products 3 with complete control of chemo- and regioselectivity. The cyclized products 3a and 5 underwent further reactions with nucleophiles and bases to give useful heterocyclic compounds. The N-tosyl group of the cyclic products could be selectively replaced by hydrogen or another substituent.
芳基磺酰基异
氰酸与
硫取代的1,3-二烯通过3-砜基烯前体1进行的首批aza-Diels-Alder反应,完全控制了
化学选择性和区域选择性地得到了环化产物3。环化产物3a和5与亲核试剂和碱进一步反应,生成了有用的
杂环化合物。环状产物的N-对
甲苯磺酰基可以被选择性地替换为氢或其他取代基。