我们已经开发了一种无金属,N-碘代琥珀酰亚胺(NIS)促进的级联策略,用于通过烯胺炔烃的[3 + 2]环合法有效合成重要的生物学上重要的茚并[1,2- c ]吡咯。该方法学显示了功能多样的烯胺和炔烃的广泛应用范围。我们还开发了一种单锅多组分策略,可通过烯胺炔烃直接从二酮中合成茚并吡咯。对照实验支持NIS通过离子机制而非自由基途径作为亲电子活化剂的参与。
Formation of Benzo[b]fluorenes and the Benzo[a]fluorene Core of the Fluostatins by Cyclization of Diaryldiynones
摘要:
[GRAPHICS]Thermal cyclization of 1-[2-(trimethylsiiylethynyl)phenyl]-3-arylpropinones was expected to give benzo[b]fluorenones. However, benzo[a] fluorenones were also formed as a result of a new rearrangement. These tetracycles possess the core structure of the fluostatins and isoprekinamycin.
Synthesis of the Benzo[b]fluorene Core of the Kinamycins by Arylalkyne–Allene and Arylalkyne–Alkyne Cycloadditions
作者:Esther González-Cantalapiedra、Óscar de Frutos、Carmen Atienza、Cristina Mateo、Antonio M. Echavarren
DOI:10.1002/ejoc.200500926
日期:2006.3
Arylalkyne–allene and arylalkyne–alkynecycloadditions yields benzo[a]fluorenones, which are related to the tetracyclic core of the kinamycins. In the arylalkyne–alkynecycloadditions, we found a rearrangement that produces benzo[a]fluorenones, in addition to the expected benzo[b]fluorenones. This rearrangement could be suppressed in the presence of phenol, which allowed the synthesis of 4,9-dimet