Synthesis of New Thiophene-Substituted 3,3-Diphenyl-3H-naphtho[2,1-b]pyrans by Cross-Coupling Reactions, Precursors of Photomodulated Materials
作者:Michel Frigoli、Corinne Moustrou、André Samat、Robert Guglielmetti
DOI:10.1002/ejoc.200300033
日期:2003.8
3,3-Diphenyl-3H-naphtho[2,1-b]pyrans linked to one, two, or three thiophene nuclei in different positions of the naphthalene moiety (5, 6, 8, and 9) by a covalent bond have been prepared in good yields. A Suzuki cross-coupling reaction was used with two possible strategies: chromenization before the coupling with oligothiophenes or chromenization after the coupling, the main intermediates being the
3,3-二苯基-3H-萘并[2,1-b]吡喃通过共价键连接到萘部分(5、6、8和9)不同位置的一个、两个或三个噻吩核以良好的产量制备。Suzuki 交叉偶联反应用于两种可能的策略:与低聚噻吩偶联前的铬烯化或偶联后的铬烯化,主要中间体是二苯基炔丙醇、官能化萘酚衍生物和噻吩硼酸酯。获得此类光致变色化合物的总产率通常非常令人满意。对于 7 位,使用四氢萘酮衍生物和噻吩溴镁中间体之间的格利雅反应实现了偶联反应。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)