作者:Cheon-Gyu Cho、Yong-Woo Kim、Young-Kwan Lim、Jung-Sang Park、Haiwon Lee、Sangman Koo
DOI:10.1021/jo015804r
日期:2002.1.1
D-A cycloadditions of 3,5-dibromo-2-pyrone were investigated with a series of electronically and sterically distinct dienophiles. Our results showed that it is a highly potent ambident diene, being more reactive and stereoselective than monobromo-2-pyrones, and thus capable of generating a variety of bicycloadducts in much higher chemical yields and endo/exo ratios than monobromo-2-pyrones. Another
用一系列电子和空间上不同的亲二烯体研究了3,5-二溴-2-吡喃酮的DA环加成反应。我们的结果表明,它是一种高效的环境二烯,比单溴-2-吡喃酮具有更高的反应性和立体选择性,因此能够以比单溴-2-吡喃酮更高的化学收率和内/外比生成各种双环加合物。这项研究的另一个有趣特征是,可以独立地控制环加合物上的两个溴基团,以产生其他合成上有用的双环内酯。