Regiospecific synthesis of mono- and bicyclic 6-alkoxy-2-pyrones and their use in the preparation of substituted aromatics, anthraquinones, and tetracyclic intermediates for 11-deoxyanthracycline synthesis
作者:Michael E. Jung、John A. Lowe、Mark A. Lyster、Manabu Node、Rudolf W. Pfluger、Richard W. Brown
DOI:10.1016/s0040-4020(01)91537-6
日期:1984.1
chrysophanol, helminthosporin, pachybasin, 2-acetylemodin and the purported structure for orientalone. The utility of this approach for the synthesis of the anthracyclines is demonstrated by its use in the preparation of various tetracyclic intermediates for anthracycline synthesis.
可以通过两种途径中的任一种通过区域专一的方法制备几个在C4和C5处具有取代基的单环和双环的6-甲氧基-2-吡喃酮:(1)戊二酸半酯的区域专一的结构,然后进行脱水环化,和(2)区域专一的Friedel -在C5上将6-甲氧基-2-吡喃酮酰化。这些吡喃酮会与各种不对称的亲双烯体进行清洁且具有区域专一性的Diels-Alder环加成反应,例如醌,不饱和酯等,随后会损失二氧化碳。以这种方式,已经制备了几种多环芳族天然产物,例如木薯酚,杀虫孢子素,厚朴素,2-乙酰基大黄素和声称的东方三烯结构。