New ‘2-phenylnaphthalene’-mediated synthesis of benzo[b]naphtho[2,3-d]furan-6,11-diones and 6-oxa-benzo[a]anthracene-5,7,12-triones: first total synthesis of 6-oxa-benzo[a]anthracen-5-ones
作者:Ana Martínez、Marcos Fernández、Juan C. Estévez、Ramón J. Estévez、Luis Castedo
DOI:10.1016/j.tet.2004.10.044
日期:2005.1
We describe here a novel synthesis of benzo[b]naphtho[2,3-d]furan-6,11-diones based on the heteroannulation of 2-(2-bromophenyl)-3-hydroxy-1,4-naphthoquinones. The naphthoquinones were prepared from 3-(2-bromophenyl)naphthalen-2-ols, which were obtained by intramolecular aldol condensation of 2-[3-(2-bromophenyl)-2-oxo-propyl]benzaldehydes. Alternatively, benzo[b]naphtho[2,3-d]furan-6,11-diones were
我们在这里描述基于2-(2-溴苯基)-3-羟基-1,4-萘醌杂环化的苯并[ b ]萘并[2,3 - d ]呋喃-6,11-二酮的新型合成方法。萘醌由3-(2-溴苯基)萘-2-醇制备,它们是通过2- [3-(2-溴苯基)-2-氧代丙基]苯甲醛的分子内醇醛缩合反应获得的。或者,通过将3-(2-溴苯基)萘-2-醇环化为苯并[ b ]萘[2] ,可以更直接,更有效地获得苯并[ b ]萘[2,3 - d ]呋喃-6,11-二酮。,3- d ]呋喃和所得化合物的氧化。此外,第一个6-氧杂苯并[ a]从2- [3-(2-甲酰基苯基)-2-氧丙基]苯甲酸类似地获得所述的蒽蒽-5-酮,并将其氧化成6-氧杂苯并[ a ]蒽-5,7,12-三酮。