A facile, one-pot synthesis of β-(benz[a]azulen-10-yl)-α,β-unsaturatedketones from the corresponding o-(2-furyl)cycloheptatrienylbenzenes is reported. A mechanism involving a novel ring-opening cyclisation reaction by the intramolecular attack of the tropylium ion to the 2-position of the furan ring is proposed.
据报道,由相应的邻-(2-呋喃基)环庚三烯基苯可方便地一锅合成β-(苯并[ a ] azulen-10-基)-α,β-不饱和酮。提出了一种涉及新的开环环化反应的机理,该环化反应是由对苯二甲基离子的分子内攻击呋喃环的2位引起的。