Environmentally benign, one-pot synthesis of pyrans by domino Knoevenagel/6π-electrocyclization in water and application to natural products
作者:Ene Jin Jung、Byung Ho Park、Yong Rok Lee
DOI:10.1039/c0gc00265h
日期:——
In water medium, environmentally benign, facile, and efficient synthesis of pyrans was achieved in good yields by the reactions of a variety of cyclic 1,3-dicarbonyls with several α,β-unsaturated aldehydes. The key strategy was a formal [3+3] cycloaddition by domino Knoevenagel/6Ï- electrocyclization. This methodology was applied to the synthesis of biologically interesting pyranocoumarin, pyranoquinolinone, and pyranonaphthoquinone derivatives along with selected natural and non-natural products.
在水相介质中,通过多种环状1,3-二羰基化合物与若干α,β-不饱和醛的反应,以良好产率实现了吡喃的环保、简便、高效合成。关键策略是形式上的[3+3]环加成,通过多米诺Knoevenagel缩合/6π电环化反应实现。这一方法被应用于生物活性吡喃香豆素、吡喃喹啉酮和吡喃萘醌衍生物的合成,以及部分天然与合成产物的制备。