Polysubstituted 2,3-dihydrofuro[2,3-b]pyridines and 3,4-dihydro-2H-pyrano[2,3-b]pyridines via microwave-activated inverse electron demand Diels–Alder reactions
作者:Youssef Hajbi、Franck Suzenet、Mostafa Khouili、Said Lazar、Gérald Guillaumet
DOI:10.1016/j.tet.2007.05.112
日期:2007.8
3-dihydrofuro[2,3-b]pyridines and 3,4-dihydro-2H-pyrano[2,3-b]pyridines have been synthesized from 1,2,4-triazines using the inverse electron Diels–Alder reaction. For this purpose, 3-methylsulfanyl-1,2,4-triazines were reacted with several nucleophiles allowing the formation of appropriately substituted alkynes to undergo the intramolecular inverse electron demand Diels–Alder reaction. Sealed-tube microwave
多聚2,3-二氢呋喃[2,3- b ]吡啶和3,4-二氢-2 H-吡喃并[2,3- b ]吡啶是由1,2,4-三嗪使用逆电子狄尔斯合成的。 der木反应。为此,使3-甲基硫烷基-1,2,4-三嗪与几种亲核试剂反应,使形成适当取代的炔烃进行分子内电子逆需求Diels-Alder反应。事实证明,环加成反应的密封管微波活化非常有效,并且反应时间更短。该策略使得能够有效合成3-羟基-2,3-二氢呋喃[2,3- b ]吡啶和4-羟基-3,4-二氢-2 H-吡喃并[2,3- b双环支架上具有多个多样性点的]吡啶。