作者:David Mootoo、Jialiang Li
DOI:10.1055/s-0033-1339281
日期:——
Bidirectional Hauser and Michael-Dieckmann annulation strategies for the preparation of bis-anthraquinoid framework of the angelimicin family of natural products are explored, using cyclohex-2-enone and biphenyl Michael donors, which are prepared from 1,2,5-trimethoxy-3-methylbenzene. The Hauser annulations are not productive, but the Michael-Dieckmann reactions proceed in 40% yield. Attempts to aromatize these biphenyl cycloadducts proved unsuccessful. This result differs from the success reported in another study of the same reaction. In contrast, aromatization of the related monomeric Michael-Dieckmann cycloadduct proceeds smoothly.