The facile and novel synthesis of β-(4-azuleno[1,2-b]thienyl) α,β-unsaturated ketones 1 from 2-tropylio-3-(2-furyl)thiophenes 7 is reported; a mechanism involving a novel ring cyclization by intramolecular attack of the tropylium ion at the 2-position of the furan ring is postulated.
报告了从 2-
丙硫基-3-(2-
呋喃基)
噻吩 7 简单合成 δ-(4-氮杂烯并[1,2-b]
噻吩基) δ,δ-不饱和酮 1 的新方法;推测了一种新的环状环化机制,该机制涉及
呋喃环 2 位上的托烷基离子的分子内攻击。