There is disclosed a method of preparing a branched benzofuran compound comprising a core moiety which contains at least one aromatic ring and which has at least three substituted or unsubstituted benzofuran groups covalently linked thereto. The method comprises the steps of
(i) forming an intermediate ethynylene compound in which at least three benzene rings are each linked to the core moiety via an ethynylene bond, and where each benzene ring is substituted at the ortho position (relative to the position of the ethynylene bond) by a blocked carbonyloxy group,
(ii) deblocking the carbonyloxy groups, and
(iii) effecting ring closure by reaction between the deblocked carbonyloxy groups and the adjacent ethynylene bonds to form the furan rings of the benzofuran groups, whereby to produce the branched benzofuran compound.
公开了一种制备支链
苯并呋喃化合物的方法,其包含至少一个芳香环核心基团,且至少有三个取代或未取代的
苯并呋喃基团与其共价键合。该方法包括以下步骤:(i)形成中间
乙炔基化合物,在该化合物中,至少有三个苯环通过
乙炔基键与核心基团连接,且每个苯环在邻位(相对于
乙炔基键的位置)处被阻断的羰基氧基团取代,(ii)去除羰基氧基团,以及(iii)通过去除羰基氧基团和相邻
乙炔基键之间的反应进行环闭合,形成
苯并呋喃基团的
呋喃环,从而产生支链
苯并呋喃化合物。