A Comparative Study on the Diastereofacial Control in the [4+2] Cycloaddition of Sorbates and the Ene Reaction of Tiglates with Singlet Oxygen and PTAD by a Variety of Chiral Auxiliaries
作者:Waldemar Adam、Sara G. Bosio、Hans-Georg Degen、Oliver Krebs、Dietmar Stalke、Dirk Schumacher
DOI:10.1002/1099-0690(200212)2002:23<3944::aid-ejoc3944>3.0.co;2-4
日期:2002.12
The auxiliary-induced diastereoselectivities of [4+2] cycloaddition and the ene reaction of singlet oxygen and PTAD through a variety of auxiliaries is studied. The different trends in the diastereoselectivities that are observed for the diverse auxiliaries, which include 2,2-dimethyloxazolidines, a menthol derivative, several related cyclohexanes, and the Oppolzer sultam, are compared and backed by
研究了 [4+2] 环加成的辅助诱导非对映选择性以及单线态氧和 PTAD 通过各种助剂的烯反应。对不同助剂(包括 2,2-二甲基恶唑烷、薄荷醇衍生物、几种相关的环己烷和 Oppolzer sultam)观察到的非对映选择性的不同趋势进行了比较,并得到了机械解释的支持。通过对两种亲电子试剂和四种不同类型助剂的两种反应模式的概述,单个助剂的优势变得明显和可理解。(© Wiley-VCH Verlag GmbH, 69451 Weinheim, Germany, 2002)