A One-Step, Versatile Synthesis of Dibenzo [n.2.2] Macrobicyclic Compounds via a Conformation-Directed Macrocyclization Reaction
摘要:
A series of dibenzo [n.2.2] bicyclic compounds (n = 2-20) were prepared in one step and good yields starting from dimethyl anthracene-9, 10-dicarboxylate. Reduction of the aromatic diester using lithium/naphthalene led to a bis-enolate that was cyclized with a variety of bis-electrophiles. The ease of the cyclization is probably due to the puckered conformation of the intermediate formed after the first alkylation step, in which the newly introduced chain that will become the bridge portion occupies a pseudoaxial position, positioning the leaving group close to the enolate nucleophile in the macrocyclization step.
A One-Step, Versatile Synthesis of Dibenzo [<i>n</i>.2.2] Macrobicyclic Compounds via a Conformation-Directed Macrocyclization Reaction
作者:Rubén Lobato、Alberte X. Veiga、Jaime Pérez-Vázquez、Fernando Fernández-Nieto、M. Rita Paleo、F. Javier Sardina
DOI:10.1021/ol4016767
日期:2013.8.16
A series of dibenzo [n.2.2] bicyclic compounds (n = 2-20) were prepared in one step and good yields starting from dimethyl anthracene-9, 10-dicarboxylate. Reduction of the aromatic diester using lithium/naphthalene led to a bis-enolate that was cyclized with a variety of bis-electrophiles. The ease of the cyclization is probably due to the puckered conformation of the intermediate formed after the first alkylation step, in which the newly introduced chain that will become the bridge portion occupies a pseudoaxial position, positioning the leaving group close to the enolate nucleophile in the macrocyclization step.